Best cold email infrastructure providers in 2026, scored and priced as a full setup

Eight email infrastructure providers for cold email, seven published criteria, every fact linked to the vendor's own page. Priced as a full setup: mailboxes, warmup and a sequencer at 25, 100 and 400 mailboxes.

Price 100 mailboxes1,000+ mailboxes? Book a call
  • Warmup and sending included
  • $2.50 a mailbox, 12 minimum
  • Month-to-month billing

Weighted score · out of 10

8 providers
  1. Outreach2dayOutreach2day: 9.1
  2. SmartleadSmartlead: 6.7
  3. InstantlyInstantly: 6.3
  4. InboxKitInboxKit: 6.3
  5. ZapmailZapmail: 6.3
  6. MailforgeMailforge: 6.1
  7. Premium InboxesPremium Inboxes: 4.6
  8. MaildosoMaildoso: 4.5

We are one of the vendors. The rules and every source are on this page.

Ranking

The scores

Out of 10, weighted. Open a vendor for each score and its source.

  1. 1Outreach2dayMailboxes + warmup + sequencer9.1 / 10
  2. 2SmartleadSequencer + mailboxes6.7 / 10
  3. 3InstantlySequencer + mailboxes6.3 / 10
  4. 4InboxKitMailboxes6.3 / 10
  5. 5ZapmailMailboxes6.3 / 10
  6. 6MailforgeMailboxes6.1 / 10
  7. 7Premium InboxesMailboxes4.6 / 10
  8. 8MaildosoMailboxes4.5 / 10

Method

How we score

Seven criteria, each scored 0 to 10 by the rule in the table. The total is the weighted average.

Cost weighs most because setups differ most there: the monthly cost of 100 mailboxes with warmup and a sequencer, at list prices. A vendor that sells mailboxes only gets the cheapest Instantly plan for the volume, because you can't send without one.

We sell mailboxes, so we are in this table. The criteria favor a bundle like ours. We lose points for no blacklist monitoring. If you already pay for a sequencer, read the mailbox price and mailbox type rows instead of the total.

Scoring criteria, weights and rules
CriterionWeight
Full-stack costMonthly cost of 100 mailboxes, warmup and a sequencer at list prices. The cheapest setup gets 10; the others get 10 × cheapest ÷ their cost.30%
Warmup10: included in the mailbox or plan price. 5: sold as a paid add-on. 2: not offered; you bring your own warmup tool.15%
Sequencer10: mailboxes and a sequencer in one subscription. 6: the same vendor sells both, as two separate purchases. 2: mailboxes only; you pay for a sequencer elsewhere.15%
Mailbox types10: Google Workspace, Microsoft 365 and SMTP mailboxes. 7: two of the three. 4: one type.10%
Setup10: domains bought in the app and SPF, DKIM and DMARC set automatically. 6: DNS set automatically, domains bought elsewhere. 3: manual DNS.10%
MonitoringOne third of 10 for each of: inbox placement tests, blacklist checks, per-mailbox health or sending stats. A separate plan or add-on still counts.10%
API and export5 for a public API, 5 for a documented way to move or connect the mailboxes to other sending tools.10%

Evidence

Every score and the fact behind it

Each line links to the vendor's public page we took the fact from.

Outreach2day9.1 / 10

Cold email mailboxes, warmup and its own sequencer with per-mailbox analytics in one subscription, $2.50 a mailbox down to $0.50 at volume.

Full-stack cost
10.0
$150 a month for 100 mailboxes with warmup and sending (100 mailboxes at $1.50 (volume price from 100), warmup and a sequencer included).source
Warmup
10.0
Warmup is included in the mailbox price.source
Sequencer
10.0
The sequencer is part of the same $2.50 subscription.source
Mailbox types
4.0
One type: SMTP/IMAP mailboxes. No Google Workspace or Microsoft 365.source
Setup
10.0
Domains are bought in the app; SPF, DKIM and DMARC are set automatically.source
Monitoring
6.7
Per-mailbox warmup inbox, spam and bounce rate, and Google and Outlook placement tests. No blacklist monitoring.source
API and export
10.0
REST API on every account; mailboxes sync to Instantly and Smartlead and export to 14 tools.source

Smartlead6.7 / 10

A cold email sending platform that resells Google, Outlook and SMTP mailboxes from partner providers as SmartSenders.

Full-stack cost
2.8
$544 a month for 100 mailboxes with warmup and sending (100 mailboxes × $4.50 + Smartlead Pro).source (opens the vendor's page in a new tab)
Warmup
10.0
Unlimited warmup is included on every plan.source (opens the vendor's page in a new tab)
Sequencer
6.0
Smartlead sells both, as two purchases: a plan and SmartSenders mailboxes.source (opens the vendor's page in a new tab)
Mailbox types
10.0
Google, Outlook and SMTP mailboxes through SmartSenders.source (opens the vendor's page in a new tab)
Setup
10.0
Domains are bought in Smartlead; DNS, SPF and DKIM are handled.source (opens the vendor's page in a new tab)
Monitoring
10.0
Placement tests, blacklist checks and sender health trends (SmartDelivery, separate plan from $49 a month).source (opens the vendor's page in a new tab)
API and export
5.0
API on Pro and above. SmartSenders mailboxes can't be used outside Smartlead.source (opens the vendor's page in a new tab)

Instantly6.3 / 10

A cold email sending platform that also sells done-for-you Google accounts, pre-warmed accounts and its own SMTP inboxes.

Full-stack cost
2.5
$597 a month for 100 mailboxes with warmup and sending (100 Google accounts × $5 + Instantly Hypergrowth).source (opens the vendor's page in a new tab)
Warmup
10.0
Warmup is included on every Outreach plan.source (opens the vendor's page in a new tab)
Sequencer
6.0
Instantly sells both, as two purchases: an Outreach plan and accounts per month.source (opens the vendor's page in a new tab)
Mailbox types
7.0
Google accounts and AirMail SMTP inboxes; Microsoft only if you connect your own.source (opens the vendor's page in a new tab)
Setup
10.0
Domains are bought in Instantly; MX, SPF, DKIM and DMARC are set up for you.source (opens the vendor's page in a new tab)
Monitoring
10.0
Account analytics on every plan; placement tests and blacklist monitoring on a separate plan from $47 a month.source (opens the vendor's page in a new tab)
API and export
5.0
API on all plans. Done-for-you accounts can't be used outside Instantly.source (opens the vendor's page in a new tab)

InboxKit6.3 / 10

Google Workspace and Microsoft 365 mailboxes at a flat per-mailbox price, with warmup as an add-on. No sequencer.

Full-stack cost
5.2
$286 a month for 100 mailboxes with warmup and sending (63 mailboxes × $3.00 (40 a day each) + Instantly Hypergrowth).source (opens the vendor's page in a new tab)
Warmup
5.0
Warmup is an add-on at $3 per mailbox a month.source (opens the vendor's page in a new tab)
Sequencer
2.0
Mailboxes only; 24+ integrations.source (opens the vendor's page in a new tab)
Mailbox types
7.0
Google Workspace and Microsoft 365.source (opens the vendor's page in a new tab)
Setup
10.0
Domains registered through InboxKit; SPF, DKIM and DMARC automated.source (opens the vendor's page in a new tab)
Monitoring
10.0
Per-mailbox analytics and alerts included; blacklist checks and placement tests in the InfraGuard add-on.source (opens the vendor's page in a new tab)
API and export
10.0
REST API with webhooks; 24+ integrations and app passwords.source (opens the vendor's page in a new tab)

Zapmail6.3 / 10

Google Workspace and Microsoft 365 mailboxes with automated DNS, sold in plans of 10, 30 and 100. No sequencer.

Full-stack cost
3.8
$396 a month for 100 mailboxes with warmup and sending (Zapmail Pro (100 mailboxes) + Instantly Hypergrowth).source (opens the vendor's page in a new tab)
Warmup
10.0
Zapmail's FAQ says warmup is handled for you.source (opens the vendor's page in a new tab)
Sequencer
2.0
Mailboxes only; they export to 50+ outreach tools.source (opens the vendor's page in a new tab)
Mailbox types
7.0
Google Workspace and Microsoft 365.source (opens the vendor's page in a new tab)
Setup
10.0
Domains are bought in Zapmail; SPF, DKIM and DMARC are set automatically.source (opens the vendor's page in a new tab)
Monitoring
6.7
Placement test credits on every plan, each with a blacklist check. We found no per-mailbox health stats on its pages.source (opens the vendor's page in a new tab)
API and export
10.0
API on the Pro plan; exports to 50+ tools.source (opens the vendor's page in a new tab)

Mailforge6.1 / 10

Shared-IP SMTP mailboxes billed per slot. Warmup (Warmforge) and sending (Salesforge) are separate Forge products.

Full-stack cost
3.5
$434 a month for 100 mailboxes with warmup and sending (Mailforge 84 slots (84 mailboxes at 30 a day) + Salesforge Growth + 1 step).source (opens the vendor's page in a new tab)
Warmup
5.0
Warmup is Warmforge, a separate Forge product.source (opens the vendor's page in a new tab)
Sequencer
6.0
Sending is Salesforge, a separate Forge product.source (opens the vendor's page in a new tab)
Mailbox types
4.0
Mailforge sells SMTP; Google and Microsoft mailboxes are a separate product, Primeforge.source (opens the vendor's page in a new tab)
Setup
10.0
Domains are bought in Mailforge; SPF, DKIM and DMARC are set automatically.source (opens the vendor's page in a new tab)
Monitoring
10.0
Placement tests, blacklist checks and per-mailbox health, in Warmforge.source (opens the vendor's page in a new tab)
API and export
10.0
Public API; works with any sending tool.source (opens the vendor's page in a new tab)

Premium Inboxes4.6 / 10

Google Workspace and Microsoft 365 inboxes, set up for you and uploaded to your sequencer. It sells no sequencer of its own.

Full-stack cost
2.2
$681.5 a month for 100 mailboxes with warmup and sending (167 inboxes × $3.50 (15 a day each) + Instantly Hypergrowth).source (opens the vendor's page in a new tab)
Warmup
2.0
Warmup runs in your own sequencer; Premium Inboxes switches it on during setup.source (opens the vendor's page in a new tab)
Sequencer
2.0
Inboxes only; they are uploaded to your sequencer.source (opens the vendor's page in a new tab)
Mailbox types
7.0
Google Workspace and Microsoft 365.source (opens the vendor's page in a new tab)
Setup
6.0
DNS and SPF/DKIM/DMARC are done for you; the page contradicts itself on whether it sells domains.source (opens the vendor's page in a new tab)
Monitoring
10.0
Dashboard and health checks; 24-hour monitoring on the Insured tier; managed operations in Email Control Centre.source (opens the vendor's page in a new tab)
API and export
10.0
Client API on every plan; inboxes are uploaded to six sequencers.source (opens the vendor's page in a new tab)

Maildoso4.5 / 10

SMTP mailboxes on Maildoso's own servers and IPs, from a 30-mailbox plan. No warmup and no sequencer.

Full-stack cost
2.9
$514.5 a month for 100 mailboxes with warmup and sending (167 Maildoso mailboxes × $2.50 (the number needed at 15 a day) + Instantly Hypergrowth).source (opens the vendor's page in a new tab)
Warmup
2.0
Not included: Maildoso tells you to use outside providers or the Instantly warmup pool.source (opens the vendor's page in a new tab)
Sequencer
2.0
Mailboxes only; they sync to Instantly, Smartlead or EmailBison.source (opens the vendor's page in a new tab)
Mailbox types
4.0
One type: SMTP mailboxes on Maildoso's servers.source (opens the vendor's page in a new tab)
Setup
10.0
Domains are bought in Maildoso; SPF, DKIM and DMARC are set automatically.source (opens the vendor's page in a new tab)
Monitoring
6.7
Placement tests every 3 days and per-mailbox health scores. We found no blacklist monitoring on its pricing page.source (opens the vendor's page in a new tab)
API and export
10.0
REST API and MCP on every plan; sync to three sequencers and CSV export.source (opens the vendor's page in a new tab)

Cost

What the full setup costs each month

Mailboxes, warmup and a sequencer at 25, 100 and 400 mailboxes (550 cold emails per mailbox a month). Domains are not included.

625 a day · 13,750 a month25 of our mailboxes; others at their own limit · USD a month
  1. Outreach2dayOutreach2day: $62.50
  2. InboxKitInboxKit: $145
  3. ZapmailZapmail: $188.50
  4. MailforgeMailforge: $159
  5. MaildosoMaildoso: $202
  6. SmartleadSmartlead: $206.50
  7. InstantlyInstantly: $222
  8. Premium InboxesPremium Inboxes: $244
2,500 a day · 55,000 a month100 of our mailboxes; others at their own limit · USD a month
  1. Outreach2dayOutreach2day: $150
  2. InboxKitInboxKit: $286
  3. ZapmailZapmail: $396
  4. MailforgeMailforge: $434
  5. MaildosoMaildoso: $514.50
  6. SmartleadSmartlead: $544
  7. InstantlyInstantly: $597
  8. Premium InboxesPremium Inboxes: $681.50
10,000 a day · 220,000 a month400 of our mailboxes; others at their own limit · USD a month
  1. Outreach2dayOutreach2day: $600
  2. InboxKitInboxKit: $1,021
  3. ZapmailZapmail: $1,470
  4. MailforgeMailforge: $1,344.80
  5. MaildosoMaildoso: $1,938.50
  6. SmartleadSmartlead: $2,028
  7. InstantlyInstantly: $2,184
  8. Premium InboxesPremium Inboxes: $2,272

  • Outreach2dayMailboxes + warmup + sequencer

    625 a day13,750 a month
    $62.50 / mo25 mailboxes at $2.50, warmup and a sequencer included $62.50
    2,500 a day55,000 a month
    $150 / mo100 mailboxes at $1.50 (volume price from 100), warmup and a sequencer included $150
    10,000 a day220,000 a month
    $600 / mo400 mailboxes at $1.50 (volume price from 100), warmup and a sequencer included $600

  • InstantlySequencer + mailboxes

    625 a day13,750 a month
    $222 / mo25 Google accounts × $5 $125 + Instantly Hypergrowth $97
    2,500 a day55,000 a month
    $597 / mo100 Google accounts × $5 $500 + Instantly Hypergrowth $97
    10,000 a day220,000 a month
    $2,184 / mo400 Google accounts × $5 $2,000 + Instantly Hypergrowth + add-on $184

  • SmartleadSequencer + mailboxes

    625 a day13,750 a month
    $206.50 / mo25 mailboxes × $4.50 $112.50 + Smartlead Pro $94
    2,500 a day55,000 a month
    $544 / mo100 mailboxes × $4.50 $450 + Smartlead Pro $94
    10,000 a day220,000 a month
    $2,028 / mo400 mailboxes × $4.50 $1,800 + Smartlead 240K sends $228

  • MaildosoMailboxes

    625 a day13,750 a month
    $202 / mo42 Maildoso mailboxes × $2.50 (the number needed at 15 a day) $105 + Instantly Hypergrowth $97
    2,500 a day55,000 a month
    $514.50 / mo167 Maildoso mailboxes × $2.50 (the number needed at 15 a day) $417.50 + Instantly Hypergrowth $97
    10,000 a day220,000 a month
    $1,938.50 / mo667 Maildoso mailboxes × $2.50 (the number needed at 15 a day) $1,667.50 + Instantly Hypergrowth + 2 Outbound add-ons $271

  • ZapmailMailboxes

    625 a day13,750 a month
    $188.50 / moZapmail Starter + 15 extra mailboxes $91.50 + Instantly Hypergrowth $97
    2,500 a day55,000 a month
    $396 / moZapmail Pro (100 mailboxes) $299 + Instantly Hypergrowth $97
    10,000 a day220,000 a month
    $1,470 / moZapmail Pro + 300 extra mailboxes $1,199 + Instantly Hypergrowth + 2 Outbound add-ons $271

  • MailforgeMailboxes

    625 a day13,750 a month
    $159 / moMailforge 21 slots (21 mailboxes at 30 a day) $63 + Salesforge Growth $96
    2,500 a day55,000 a month
    $434 / moMailforge 84 slots (84 mailboxes at 30 a day) $252 + Salesforge Growth + 1 step $182
    10,000 a day220,000 a month
    $1,344.80 / moMailforge 334 slots (334 mailboxes at 30 a day) $904.80 + Salesforge Growth + 4 steps $440

  • Premium InboxesMailboxes

    625 a day13,750 a month
    $244 / mo42 inboxes × $3.50 (15 a day each) $147 + Instantly Hypergrowth $97
    2,500 a day55,000 a month
    $681.50 / mo167 inboxes × $3.50 (15 a day each) $584.50 + Instantly Hypergrowth $97
    10,000 a day220,000 a month
    $2,272 / mo667 inboxes × $3.00 (15 a day each) $2,001 + Instantly Hypergrowth + 2 Outbound add-ons $271

  • InboxKitMailboxes

    625 a day13,750 a month
    $145 / mo16 mailboxes × $3.00 (40 a day each) $48 + Instantly Hypergrowth $97
    2,500 a day55,000 a month
    $286 / mo63 mailboxes × $3.00 (40 a day each) $189 + Instantly Hypergrowth $97
    10,000 a day220,000 a month
    $1,021 / mo250 mailboxes × $3.00 (40 a day each) $750 + Instantly Hypergrowth + 2 Outbound add-ons $271

How we count: every vendor at the same emails a day, each at its own published emails per mailbox a day (ours 25, Premium Inboxes 15, Maildoso 15, Mailforge 30, InboxKit 40), so a cheap mailbox that sends fewer emails needs more mailboxes. A month is 22 sending days, so emails a month = emails a day × 22. List prices on monthly billing, in USD, excluding domains, taxes and discounts. A mailbox-only vendor cannot send campaigns on its own, so its total is the full sending setup: its mailboxes, domains and the sequencer plan that covers the volume. Instantly is the reference sequencer, on its published plans for the emails and new contacts a month (emails ÷ 3); Smartlead where Instantly publishes no plan; Mailforge with Salesforge, because its mailboxes cannot be warmed in Instantly. The mailbox line is listed on its own in every cell.Outreach2day on comparison pages: $2.50 a mailbox up to 99, $1.50 from 100, $0.50 from 1,000.

New · Outreach2day volume pricing

The mailbox price falls from 100 and again from 1,000 mailboxes

Warmup, the sequencer and the replies inbox included at every tier

  1. Up to 99 mailboxes$2.50a mailbox a month
  2. From 100 mailboxes$1.50a mailbox a month
  3. From 1,000 mailboxes$0.50a mailbox a month

Enterprise plan. Better prices for larger volumes.

Book a call

At scale

From 25,000 to 1,000,000 cold emails a day

The same setups at larger daily volumes. A vendor without a published price at a size reads “Custom pricing (not published)” and has no bar.

Running 25,000+ a day? Enterprise plan: better prices for larger volumes.Book a call

25,000 a day · 550,000 a month1,000 mailboxes · USD a month
  1. Outreach2day all-inOutreach2day all-in: $716.67
  2. Instantly + its done-for-you Google accountsInstantly + its done-for-you Google accounts: $5,956
  3. Smartlead + its SmartSenders Google mailboxesSmartlead + its SmartSenders Google mailboxes: $5,176.67
  4. Maildoso + InstantlyMaildoso + Instantly: $1,965.25
  5. Zapmail + InstantlyZapmail + Instantly: $4,066.83
  6. Mailforge + SalesforgeMailforge + Salesforge: $3,123.13
  7. Premium Inboxes + InstantlyPremium Inboxes + Instantly: from $5,373.60
InboxKit + Instantly: no published price at this volume, so no bar.
50,000 a day · 1,100,000 a month2,000 mailboxes · USD a month
  1. Outreach2day all-inOutreach2day all-in: $1,433.33
  2. Instantly + its done-for-you Google accountsInstantly + its done-for-you Google accounts: $11,815
  3. Smartlead + its SmartSenders Google mailboxesSmartlead + its SmartSenders Google mailboxes: $10,173.33
  4. Maildoso + InstantlyMaildoso + Instantly: $3,708.25
  5. Zapmail + InstantlyZapmail + Instantly: $8,036.58
  6. Mailforge + SalesforgeMailforge + Salesforge: $5,894.67
  7. Premium Inboxes + InstantlyPremium Inboxes + Instantly: from $10,650.20
InboxKit + Instantly: no published price at this volume, so no bar.
100,000 a day · 2,200,000 a month4,000 mailboxes · USD a month
  1. Outreach2day all-inOutreach2day all-in: $2,866.67
  2. Instantly + its done-for-you Google accountsInstantly + its done-for-you Google accounts: $23,620
  3. Smartlead + its SmartSenders Google mailboxesSmartlead + its SmartSenders Google mailboxes: $20,322.67
  4. Maildoso + InstantlyMaildoso + Instantly: $7,155.50
  5. Zapmail + InstantlyZapmail + Instantly: $16,064.17
  6. Premium Inboxes + InstantlyPremium Inboxes + Instantly: from $21,287.60
Mailforge + Salesforge, InboxKit + Instantly: no published price at this volume, so no bar.
250,000 a day · 5,500,000 a month10,000 mailboxes · USD a month
  1. Outreach2day all-inOutreach2day all-in: $7,166.67
Instantly + its done-for-you Google accounts, Smartlead + its SmartSenders Google mailboxes, Maildoso + Instantly, Zapmail + Instantly, Mailforge + Salesforge, Premium Inboxes + Instantly, InboxKit + Instantly: no published price at this volume, so no bar.
500,000 a day · 11,000,000 a month20,000 mailboxes · USD a month
  1. Outreach2day all-inOutreach2day all-in: $14,333.33
Instantly + its done-for-you Google accounts, Smartlead + its SmartSenders Google mailboxes, Maildoso + Instantly, Zapmail + Instantly, Mailforge + Salesforge, Premium Inboxes + Instantly, InboxKit + Instantly: no published price at this volume, so no bar.
1,000,000 a day · 22,000,000 a month40,000 mailboxes · USD a month
  1. Outreach2day all-inOutreach2day all-in: $28,666.67
Instantly + its done-for-you Google accounts, Smartlead + its SmartSenders Google mailboxes, Maildoso + Instantly, Zapmail + Instantly, Mailforge + Salesforge, Premium Inboxes + Instantly, InboxKit + Instantly: no published price at this volume, so no bar.
Monthly cost of mailboxes, warmup and sending by vendor from 25,000 to 1,000,000 cold emails a day
Setup25,000 a day550,000 a month1,000 mailboxes50,000 a day1,100,000 a month2,000 mailboxes100,000 a day2,200,000 a month4,000 mailboxes250,000 a day5,500,000 a month10,000 mailboxes500,000 a day11,000,000 a month20,000 mailboxes1,000,000 a day22,000,000 a month40,000 mailboxes
Outreach2day all-in$716.67$1,433.33$2,866.67$7,166.67$14,333.33$28,666.67
Instantly + its done-for-you Google accounts$5,956$5,239.33 more$11,815$10,381.67 more$23,620$20,753.33 moreCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)
Smartlead + its SmartSenders Google mailboxes$5,176.67$4,460 more$10,173.33$8,740 more$20,322.67$17,456 moreCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)
Maildoso + Instantly$1,965.25$1,248.58 more$3,708.25$2,274.92 more$7,155.50$4,288.83 moreCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)
Zapmail + Instantly$4,066.83$3,350.16 more$8,036.58$6,603.25 more$16,064.17$13,197.50 moreCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)
Mailforge + Salesforge$3,123.13$2,406.46 more$5,894.67$4,461.34 moreCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)Custom pricing (not published)
Premium Inboxes + Instantlyfrom $5,373.60$4,656.93 morefrom $10,650.20$9,216.87 morefrom $21,287.60$18,420.93 moreCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)
InboxKit + InstantlyCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)Custom pricing (not published)Custom pricing (not published)Custom pricing (not published)

Outreach2day: 25 cold emails per mailbox a day, 5 mailboxes per domain, .com domains at $13 a year (1,000 mailboxes and 200 domains at 25,000 a day; 40,000 and 8,000 at 1,000,000). Instantly and Smartlead with the accounts they sell, at the published plan for the volume; mailbox vendors at their own emails-per-mailbox limit with their domains and the Instantly (Mailforge: Salesforge) plan for the volume. A month is 22 sending days, so emails a month = emails a day × 22. Where a vendor publishes no price at that size the cell says so and the chart leaves it out. At this size the main table's flat $2.50 a Maildoso mailbox gives way to its published packs.

Every line at scale

  • Outreach2day all-in, 25,000 a day: 1,000 mailboxes at $0.50 (volume price from 1,000), warmup and sequencer included ($500) + 200 domains at $13 a year ($216.67) = $716.67
  • Outreach2day all-in, 50,000 a day: 2,000 mailboxes at $0.50 (volume price from 1,000), warmup and sequencer included ($1,000) + 400 domains at $13 a year ($433.33) = $1,433.33
  • Outreach2day all-in, 100,000 a day: 4,000 mailboxes at $0.50 (volume price from 1,000), warmup and sequencer included ($2,000) + 800 domains at $13 a year ($866.67) = $2,866.67
  • Outreach2day all-in, 250,000 a day: 10,000 mailboxes at $0.50 (volume price from 1,000), warmup and sequencer included ($5,000) + 2,000 domains at $13 a year ($2,166.67) = $7,166.67
  • Outreach2day all-in, 500,000 a day: 20,000 mailboxes at $0.50 (volume price from 1,000), warmup and sequencer included ($10,000) + 4,000 domains at $13 a year ($4,333.33) = $14,333.33
  • Outreach2day all-in, 1,000,000 a day: 40,000 mailboxes at $0.50 (volume price from 1,000), warmup and sequencer included ($20,000) + 8,000 domains at $13 a year ($8,666.67) = $28,666.67
  • Instantly + its done-for-you Google accounts, 25,000 a day: Instantly Light Speed + 4 Outbound add-ons ($706) source (opens the vendor's page in a new tab) + 1,000 done-for-you Google accounts at $5 ($5,000) + 200 domains at $15 a year ($250) = $5,956
  • Instantly + its done-for-you Google accounts, 50,000 a day: Instantly Light Speed + 11 Outbound add-ons ($1,315) source (opens the vendor's page in a new tab) + 2,000 done-for-you Google accounts at $5 ($10,000) + 400 domains at $15 a year ($500) = $11,815
  • Instantly + its done-for-you Google accounts, 100,000 a day: Instantly Light Speed + 26 Outbound add-ons ($2,620) source (opens the vendor's page in a new tab) + 4,000 done-for-you Google accounts at $5 ($20,000) + 800 domains at $15 a year ($1,000) = $23,620
  • Smartlead + its SmartSenders Google mailboxes, 25,000 a day: Smartlead Smart, 630K step ($460) source (opens the vendor's page in a new tab) + 1,000 SmartSenders Google mailboxes at $4.50 ($4,500) + 200 domains at $13 a year ($216.67) = $5,176.67
  • Smartlead + its SmartSenders Google mailboxes, 50,000 a day: Smartlead Smart, 1.11M step ($740) source (opens the vendor's page in a new tab) + 2,000 SmartSenders Google mailboxes at $4.50 ($9,000) + 400 domains at $13 a year ($433.33) = $10,173.33
  • Smartlead + its SmartSenders Google mailboxes, 100,000 a day: Smartlead Smart, 2.37M step ($1,456) source (opens the vendor's page in a new tab) + 4,000 SmartSenders Google mailboxes at $4.50 ($18,000) + 800 domains at $13 a year ($866.67) = $20,322.67
  • Maildoso + Instantly, 25,000 a day: 2 × 1,000 pack ($998) source (opens the vendor's page in a new tab) + 209 domains at $15 a year ($261.25) + Instantly Hypergrowth + 7 Outbound add-ons (sequencer, warmup) ($706) = $1,965.25
  • Maildoso + Instantly, 50,000 a day: 3 × 1,000 pack + 1 × 300 pack + 2 × 30 pack ($1,872) source (opens the vendor's page in a new tab) + 417 domains at $15 a year ($521.25) + Instantly Hypergrowth + 14 Outbound add-ons (sequencer, warmup) ($1,315) = $3,708.25
  • Maildoso + Instantly, 100,000 a day: 7 × 1,000 pack ($3,493) source (opens the vendor's page in a new tab) + 834 domains at $15 a year ($1,042.50) + Instantly Hypergrowth + 29 Outbound add-ons (sequencer, warmup) ($2,620) = $7,155.50
  • Zapmail + Instantly, 25,000 a day: Pro + 900 extra mailboxes ($2,999) source (opens the vendor's page in a new tab) + 334 domains at $13 a year ($361.83) + Instantly Hypergrowth + 7 Outbound add-ons (sequencer, warmup) ($706) = $4,066.83
  • Zapmail + Instantly, 50,000 a day: Pro + 1900 extra mailboxes ($5,999) source (opens the vendor's page in a new tab) + 667 domains at $13 a year ($722.58) + Instantly Hypergrowth + 14 Outbound add-ons (sequencer, warmup) ($1,315) = $8,036.58
  • Zapmail + Instantly, 100,000 a day: Pro + 3900 extra mailboxes ($11,999) source (opens the vendor's page in a new tab) + 1,334 domains at $13 a year ($1,445.17) + Instantly Hypergrowth + 29 Outbound add-ons (sequencer, warmup) ($2,620) = $16,064.17
  • Mailforge + Salesforge, 25,000 a day: 834 slots (10 at $3, the rest at $2.20) ($1,842.80) source (opens the vendor's page in a new tab) + 278 domains at $14 a year ($324.33) + Salesforge Growth + 10 steps (sequencer, Warmforge warmup) ($956) = $3,123.13
  • Mailforge + Salesforge, 50,000 a day: 1667 slots (10 at $3, the rest at $2.00) ($3,344) source (opens the vendor's page in a new tab) + 556 domains at $14 a year ($648.67) + Salesforge Growth + 21 steps (sequencer, Warmforge warmup) ($1,902) = $5,894.67
  • Premium Inboxes + Instantly, 25,000 a day: 1667 inboxes at $2.80 (Enterprise) ($4,667.60) source (opens the vendor's page in a new tab) + 556 domains, price not published (not published) + Instantly Hypergrowth + 7 Outbound add-ons (sequencer, warmup) ($706) = from $5,373.60
  • Premium Inboxes + Instantly, 50,000 a day: 3334 inboxes at $2.80 (Enterprise) ($9,335.20) source (opens the vendor's page in a new tab) + 1,112 domains, price not published (not published) + Instantly Hypergrowth + 14 Outbound add-ons (sequencer, warmup) ($1,315) = from $10,650.20
  • Premium Inboxes + Instantly, 100,000 a day: 6667 inboxes at $2.80 (Enterprise) ($18,667.60) source (opens the vendor's page in a new tab) + 2,223 domains, price not published (not published) + Instantly Hypergrowth + 29 Outbound add-ons (sequencer, warmup) ($2,620) = from $21,287.60

Why each plan at scale

Price 100 mailboxes1,000+ mailboxes? Book a call

Included in the $2.50

Everything a cold email setup needs, in one mailbox price

One subscription at $2.50 a mailbox, from 12 mailboxes ($30 a month), everything included

  • Sequencer included

    Warmup and a sequencer

    Warmup for the life of every mailbox; campaigns with follow-ups and send windows; one inbox for the replies

  • Per mailbox

    Analytics that show which mailboxes still land

    Warmup inbox, spam and bounce rate per mailbox, sends by recipient provider, Google and Outlook placement tests

  • REST API

    An API on every account

    Script domains, DNS and warmup, or pull mailbox data into your own tools

  • MCP server

    Run it from Claude, Cursor or Codex

    Your assistant checks domains, quotes mailboxes and sets up DNS, warmup and campaigns; you approve and pay on Stripe. Setup for each client

  • Deliverability

    SSL domain masking and link protection

    SSL on sending domains and automatic link replacement; SPF, DKIM, DMARC and a redirect to your site set up automatically

  • Hundreds of mailboxes

    Enterprise support

    A shared Slack channel and a dedicated account team, for companies running hundreds or thousands of mailboxes. Talk to us

  • 14 tools

    Keep the sequencer you already use

    Instantly and Smartlead sync by API key; 12 more get a CSV in their own import format. Setup per tool

Free guide19 min read

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Directory

Side-by-side comparisons

Buying guides

Reviews

Vendor reviews

One vendor per page, from its own pricing page, docs and terms: plans, limits, warmup, API and MCP, refunds, ratings, who it fits.

Vendor vs vendor

Two other vendors side by side, for buyers choosing between them.

Sequencers

Cold email sequencers

Instantly, Smartlead, Reply.io, Apollo, lemlist and others from their own pages, each priced as a full setup (sequencer plan, mailboxes and domains) at 1,000, 5,000 and 10,000 cold emails a day.

MCP

Cold email MCP servers, compared

Each vendor's official MCP server next to ours: what the tools cover, from the vendor's own docs.

Pricing

Each vendor's pricing, plan by plan

Every plan, the add-ons and domains that are billed on top, and the monthly cost at 25, 100 and 400 mailboxes.

Deliverability

Deliverability questions

FAQ

Questions

What is cold email infrastructure?

The mailboxes and domains you send cold email from, their DNS records (SPF, DKIM, DMARC), warmup, and the tool that sends the sequences. Email infrastructure providers split the same way: some sell only mailboxes, some only the sending tool, some both.

What should I check before choosing a cold email infrastructure provider?

The full monthly cost at your mailbox count: mailboxes, warmup and a sequencer together. Then the mailbox type (SMTP/IMAP, Google Workspace or Microsoft 365), the cold emails each mailbox may send a day (vendors state 15 to 50), mailboxes per domain, and whether warmup is included and keeps running after launch.

Also the minimum order and billing term (monthly, quarterly or yearly), who the domains are registered to, the API, CSV export and the sequencers the mailboxes connect to, placement tests and blacklist checks, and the refund and trial terms.

Shared or dedicated IPs for cold email?

On shared IPs many customers send from the same pool, so its reputation depends on everyone in it; Mailforge sells SMTP slots this way. A dedicated IP carries only your own reputation; Infraforge sells dedicated IPs at $99 a month for each extra one, and Mailreef sells a dedicated server per 50,000 cold emails a month. Google Workspace and Microsoft 365 mailboxes send from Google's and Microsoft's own servers.

A dedicated IP does not fix a weak list or copy that gets marked as spam. Whichever you pick, measure placement per mailbox and per recipient provider, and pause mailboxes whose numbers drop.

Where are Infraforge, Primeforge, Mailreef and Inframail?

Each has its own review, linked under Vendor reviews below, with its plans, limits and refund terms. The Infraforge, Primeforge and Mailreef reviews also price 2,500 cold emails a day as a full setup next to ours.

Replacing one of them: Mailreef alternatives, Inframail alternatives, Maildoso alternatives and Mailscale alternatives each rank the options against that vendor's own terms.

Which cold email infrastructure provider is cheapest?

For the full setup at 100 mailboxes: Outreach2day, at $150 a month. At 400 mailboxes: $600 with us, against $1,938.50 for Maildoso ($2.50 per mailbox on its 30-mailbox plan) plus an Instantly plan.

Outreach2day mailboxes are $2.50 a mailbox up to 99, $1.50 from 100, $0.50 from 1,000, with warmup, the sequencer and the replies inbox included at every tier. For larger volumes and better prices there is the Enterprise plan: book a call and we size it with you.

Do I need Google Workspace or Microsoft 365 mailboxes for cold email?

No. Most people think only Google gets to the inbox and overpay for it. Our mailboxes are SMTP/IMAP on our own infrastructure, and they land in the inbox.

Why does Outreach2day score highest?

The criteria reward what we built: warmup and sending inside the mailbox price and a low full-setup cost. We lose points for no blacklist monitoring. The rules are published above, so you can re-weight them.

How often are these facts updated?

Vendors change prices often. The date each price was checked is printed under Sources. Found an outdated price? Email [email protected] and we'll fix it.

Deliverability call

Talk to our deliverability team

Book a call with the people who run our mailbox infrastructure. We look at your current setup and tell you what to change. Running 1,000+ mailboxes? We also quote a volume price below every vendor list price in our comparisons, warmup and sending included.

  • Review your domains, DNS records and current inbox placement
  • Size the setup: domains, mailboxes per domain and daily volume per mailbox
  • Plan warmup and the move from your current provider or sequencer
  • 1,000+ mailboxes: a volume price per mailbox for your setup

Free call

See open times in your time zone and book on this page.

Or open the booking page

Sources

Checked . Vendors change prices and plans; if something here is out of date, write to [email protected] and we will fix it.

Outreach2day
Instantly
Smartlead
Maildoso
Zapmail
Mailforge
Premium Inboxes
InboxKit

Full volume from day 14: 25 cold emails a mailbox a day

Add domains, create mailboxes and turn on warmup. You see every mailbox's warmup numbers from day one.

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Price 100 mailboxes

PDF report

The Best Cold Email Infrastructure Providers in 2026

A condensed, citable edition with the verdict first. Free, no sign-up. All reports

Download the PDF report

PDF report

Cold Email Infrastructure Head to Head in 2026: Outreach2day vs Six Providers

A condensed, citable edition with the verdict first. Free, no sign-up. All reports

Download the PDF report