Maildoso alternatives: SMTP, Google and Microsoft mailboxes, priced with warmup and a sender

Maildoso alternatives for teams that want warmup and sending in the mailbox price. Maildoso sells SMTP mailboxes on its own servers and IPs, $2.50 each on its 30-mailbox plan ($75 a month), and syncs them to Instantly, Smartlead and EmailBison. Warmup and sending come from those tools: Maildoso asks for at least 14 days of warmup from another provider or the Instantly pool before the first campaign. The seven options below, Outreach2day first because we make it, are priced with 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

Full setup · 2,500 cold emails a day

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
Mailboxes, warmup and a sequencer at list prices, 55,000 cold emails a month. Line items and sources
teams have used Outreach2day
3,600+
emails sent a day
40M+

Among them

  • SalesSourcers
  • Vivid
  • OptiQ.AI
  • SLSBMB
  • Outreacher
  • Outpush

Why people switch

Why teams look for Maildoso alternatives

Three terms from Maildoso's own pages that send people looking for Maildoso alternatives, each next to what Outreach2day does. Monthly prices.

  1. 15

    cold emails per mailbox a day

    A lower daily limit per mailbox

    Maildoso's terms allow up to 15 cold emails per mailbox a day, ramped up from 1. More volume means more mailboxes and more domains.Maildoso terms of service (opens the vendor's page in a new tab)

    Maildoso
    Up to 15 cold emails a mailbox a day
    Ours
    Up to 25 a mailbox a day from day 14

  2. 14+ days

    of warmup in an outside tool

    Warmup and sending are separate purchases

    Maildoso's terms say it provides no warmup: each new mailbox is warmed for at least 14 days in a third-party warmup or sequencing tool you choose and pay for.Maildoso terms of service (opens the vendor's page in a new tab)

    Maildoso
    Mailbox pack, then a warmup tool and a sequencer
    Ours
    Warmup and the sequencer in the mailbox price

  3. 30

    mailboxes in the smallest pack

    Packs of 30, 300 and 1,000

    Maildoso sells 30 mailboxes for $75 a month, 300 for $225 and 1,000 for $499, with domains extra. Between packs you pay for the next size up.Maildoso pricing (opens the vendor's page in a new tab)

    Maildoso
    30, 300 or 1,000 mailboxes, domains extra
    Ours
    Any count from 12: $2.50 a mailbox, $1.50 from 100, $0.50 from 1,000
up to 99$2.50a mailbox a month
from 100$1.50a mailbox a month
from 1,000$0.50a mailbox a month
Enterprise plan for larger volumesBook a call

Outreach2day prices per mailbox a month. Warmup, the sequencer and the replies inbox are included at every tier.

Ranked

7 Maildoso alternatives, ranked

Why each one is an alternative to Maildoso, its mailbox price with the source, whether warmup and sending are included, and the full setup at 2,500 cold emails a day. We make Outreach2day and list it first.

  1. 1. Outreach2day: the same SMTP mailbox with warmup and sending running

    The same kind of mailbox as Maildoso, SMTP/IMAP on your domains at $2.50, with the two things Maildoso leaves out already running: warmup and a sequencer. Each of ours is planned for up to 25 cold emails a day, where Maildoso sets 15, so the same volume needs fewer mailboxes.price source

    Included Warmup includedIncluded Sending included

    Full setup

    $150 / mo

    2,500 cold emails a day · Mailboxes + warmup + sequencer

  2. 2. Mailforge: shared-IP SMTP slots with Forge warmup

    Another SMTP seller on shared infrastructure, billed per slot: $3 a month up to 110 slots, falling by $0.10 per 100 add-on slots to $2. Like Maildoso it sells mailboxes only; the Forge family adds warmup as Warmforge and sending as Salesforge.price source (opens the vendor's page in a new tab)

    Partly, or at extra cost Warmup extra or partialNot included Sending not includedMailforge alternatives

    Full setup

    $434 / mo

    2,500 cold emails a day · Mailboxes

  3. 3. Zapmail: moving from SMTP to Google or Microsoft

    Pick Zapmail if leaving Maildoso means leaving SMTP: Google Workspace and Microsoft 365 mailboxes from $39 for 10, with warmup handled per its FAQ and domains that stay yours. Sending still needs a sequencer.price source (opens the vendor's page in a new tab)

    Included Warmup includedNot included Sending not includedZapmail alternatives

    Full setup

    $396 / mo

    2,500 cold emails a day · Mailboxes

  4. 4. InboxKit: Google or Microsoft mailboxes below 30

    Google or Microsoft mailboxes at $3 a month each with no minimum, where Maildoso's plan starts at 30. Warmup is a $3 add-on, and you keep your sequencer.price source (opens the vendor's page in a new tab)

    Partly, or at extra cost Warmup extra or partialNot included Sending not includedInboxKit alternatives

    Full setup

    $286 / mo

    2,500 cold emails a day · Mailboxes

  5. 5. Premium Inboxes: inboxes built and uploaded for you

    For teams that want people to build the inboxes: Google and Microsoft, DNS checked by hand, delivered into the sequencer Maildoso syncs to today, with flagged inboxes replaced for free. $3.50 per inbox under 250.price source (opens the vendor's page in a new tab)

    Partly, or at extra cost Warmup extra or partialNot included Sending not includedPremium Inboxes alternatives

    Full setup

    $681.50 / mo

    2,500 cold emails a day · Mailboxes

  6. 6. Instantly: accounts bought inside the Instantly you sync to

    If you sync Maildoso mailboxes into Instantly today, Instantly can also sell the accounts: done-for-you Google accounts at $5 and AirMail SMTP inboxes at $4 a month, tied to your Instantly workspace.price source (opens the vendor's page in a new tab)

    Included Warmup includedPartly, or at extra cost Sending extra or partialInstantly alternatives

    Full setup

    $597 / mo

    2,500 cold emails a day · Sequencer + mailboxes

  7. 7. Smartlead: mailboxes bought inside the Smartlead you sync to

    If you sync into Smartlead today, SmartSenders sells Google and Outlook mailboxes at $4.50 and SMTP from $3.99, usable only inside Smartlead.price source (opens the vendor's page in a new tab)

    Included Warmup includedPartly, or at extra cost Sending extra or partialSmartlead alternatives

    Full setup

    $544 / mo

    2,500 cold emails a day · Sequencer + mailboxes

Why us

Why Outreach2day tops this list

  1. Warmup from day one

    Maildoso leaves warmup to outside tools; ours starts on day one and runs for the life of the mailbox

  2. Sequencer included

    Campaigns, sequences and a reply inbox are in the $2.50

  3. Up to 25 a day per mailbox

    Maildoso caps mailboxes at 15 cold emails a day; we recommend up to 25

Maildoso runs inbox placement tests every 3 days and gives each mailbox a health score, for teams that already pay for warmup and a sequencer.

Cost

What the full setup costs each month

Mailboxes, warmup and a sequencer at the same email volume, every line item listed. Set your volume.

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
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
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

  • 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

  • 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

  • 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

  • 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

  • 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

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.

Your saving · 10,000 a day

You save $1,338.50 a month ($16,062 a year)with Outreach2day at 10,000 cold emails a day, against the full Maildoso setup at list prices

We move your mailboxes and campaigns for you, free

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

Emails per mailbox

Each Outreach2day mailbox sends 25 cold emails a day from day 14, Maildoso's 15: 1.67× the volume per mailbox

Outreach2day, full setup per 1,000 emails
$3.12
All in: $171.67 a month, sequencer and warmup included. Mailboxes alone: $1.50 ÷ (25 × 22) = $2.73
Maildoso, full setup per 1,000 emails
$6.33
With Instantly Hypergrowth: $348.25 a month. Mailboxes alone: $1.35 ÷ (15 × 22) = $4.08

2,500 cold emails a day (167 Maildoso mailboxes, 100 of ours), 22 sending days. Maildoso sells mailboxes only, so its full setup adds the sequencer that sends them; every line is in the cost table.

Cold emails a mailbox a day
  1. Outreach2dayOutreach2day: 25 a day
  2. MaildosoMaildoso: 15 a day

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. Mailforge + SalesforgeMailforge + Salesforge: $3,123.13
  3. Zapmail + InstantlyZapmail + Instantly: $4,066.83
  4. Maildoso + InstantlyMaildoso + Instantly: $1,965.25
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. Mailforge + SalesforgeMailforge + Salesforge: $5,894.67
  3. Zapmail + InstantlyZapmail + Instantly: $8,036.58
  4. Maildoso + InstantlyMaildoso + Instantly: $3,708.25
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. Zapmail + InstantlyZapmail + Instantly: $16,064.17
  3. Maildoso + InstantlyMaildoso + Instantly: $7,155.50
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
Mailforge + Salesforge, Zapmail + Instantly, InboxKit + Instantly, Maildoso + 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
Mailforge + Salesforge, Zapmail + Instantly, InboxKit + Instantly, Maildoso + 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
Mailforge + Salesforge, Zapmail + Instantly, InboxKit + Instantly, Maildoso + Instantly: no published price at this volume, so no bar.
Monthly cost of mailboxes, warmup and sending from 25,000 to 1,000,000 cold emails a day: Outreach2day, Mailforge, Zapmail, InboxKit, Maildoso
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
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)
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)
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)
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)

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
  • 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
  • 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
  • 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

Why each plan at scale

Outreach2day, mailboxes/ moWarmup, sending, the inbox and analytics included.
Buy 100 mailboxes
Mailboxes
Domains
Per 1k emails

The same volume elsewhere

more a month on Maildoso, for the same 55,000 emails

  1. Outreach2dayall included
    Mailboxes with warmup and a sequencer included
  2. Maildoso more
    mailboxes: $2.50 each, Maildoso's price per mailbox on its 30-mailbox plan ($75 a month); up to 15 cold emails per mailbox a day, so we count the mailboxes needed for the same email volume; sequencer with warmup, the full sending setup: Instantly's published plan for the emails and new contacts a month (Growth $47, Hypergrowth $97, Light Speed $358, Outbound add-ons $87 each)

Side by side

Maildoso and more options side by side

Maildoso's closest competitors are other SMTP vendors. Lowest published per-mailbox price, smallest order, warmup, API and MCP for each, from their own pages in October 2026.

Outreach2day fits if

  • You run 100+ mailboxes: $1.50 a mailbox from 100 and $0.50 from 1,000, warmup and the sequencer included; larger volumes on the Enterprise plan
  • You want 25 cold emails per mailbox a day instead of Maildoso's 15
  • You want warmup and a sequencer without paying for a third-party warmup pool and a separate sequencer
  • You need 12 to 30 mailboxes and Maildoso's smallest pack is 30

Outreach2day does not fit if

  • You want IP rotation managed across a large shared pool

Maildoso

Maildoso: what it charges, limits and who it fits

From Maildoso's own pages; each line links its source.

Pricing model

source (opens the vendor's page in a new tab)
Monthly plans by mailbox count, starting at 30 mailboxes for $75 ($2.50 each). Quarterly plans that bundle domains are marked legacy.

Domains

source (opens the vendor's page in a new tab)
$12 a year, $15 from October 1, 2026; included only in the legacy quarterly plans. Domains bought through Maildoso are registered to and managed by Maildoso while it services them; transfer out is free on request.

Sending limits

source (opens the vendor's page in a new tab)
Up to 15 cold emails and 80 warmup emails per mailbox a day. Up to 99 mailboxes per domain, 8 recommended. Built for B2B; campaigns to personal addresses are discouraged.

Mailbox type

source (opens the vendor's page in a new tab)
SMTP only, on Maildoso's own servers and IPs with IP rotation. Mailboxes that burn out are pulled from campaigns for 14 days to recover.

Warmup

source (opens the vendor's page in a new tab)
Not supplied. Maildoso asks for at least 14 days of warmup from another provider or the Instantly warmup pool, kept on for the life of the mailbox.

Refunds

source (opens the vendor's page in a new tab)
Only when mailboxes fail to send for 3 or more consecutive days through Maildoso's fault, within 30 days of the first payment. Domains are never refunded.

Read on .

What Maildoso is good at

Pick Maildoso if

  • You want inbox placement tests every 3 days and a health score for each mailbox

Every Maildoso plan and add-on is in Maildoso pricing.

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

The details

What a Maildoso setup needs besides the mailbox

A Maildoso mailbox is $2.50 on the 30-mailbox plan ($75 a month). The setup needs two more tools: warmup, which Maildoso asks you to run for at least 14 days before the first campaign and keep on for the life of the mailbox, and a sequencer. Maildoso syncs to Instantly, Smartlead and EmailBison and exports CSV for 9 sequencers.

Instantly's plans include warmup, so our cost table pairs Maildoso with the cheapest Instantly plan for the volume: Hypergrowth at $97 a month for 100 of our mailboxes. If you send from another tool, replace that line with its price.

Maildoso's plan, limits and refund terms: Maildoso pricing 2026. Maildoso and Outreach2day compared fact by fact: Outreach2day vs Maildoso.

Daily limits and mailboxes per domain

Maildoso's pricing page sets up to 15 cold and 80 warmup emails per mailbox a day and allows up to 99 mailboxes on a domain, 8 recommended. It is built for B2B and discourages campaigns to personal addresses.

We plan each mailbox for up to 25 cold emails a day and put up to 5 mailboxes on a domain. The cold volume of 100 of our mailboxes (20 domains) takes 167 Maildoso mailboxes, 21 domains at 8 a domain.

Replacing a burned mailbox

Maildoso pulls a mailbox that burns out from campaigns for 14 days to recover, and you can delete and recreate a mailbox in its slot at no extra cost.

With us, you delete the mailboxes of a burned domain and reuse the slots on a new domain at no extra mailbox cost. The new mailboxes warm up for 14 days before cold sending.

Who holds the domains

Domains bought through Maildoso cost $15 a year from October 1, 2026 ($12 before). Maildoso registers and manages them while it services them, and its terms say it transfers them out free on request.

Domains bought in Outreach2day are registered to you: $13 a year for a .com, $5 for a .info. Zapmail's domains belong to the buyer, and Mailforge supports transfers in and out. Instantly keeps the domains of its done-for-you accounts, and SmartSenders domains expire after 12 months.

Pick by the tool you send from

Instantly: keep it and connect our mailboxes with an API key, or buy Instantly's own accounts inside it.

Smartlead: the same two choices, with SmartSenders as Smartlead's own mailboxes.

EmailBison or another sequencer: our mailboxes export as a CSV in the import format of 14 tools, EmailBison among them. Zapmail exports to 50+ tools and InboxKit to 24+.

No sequencer yet: Outreach2day is the one option on this list with sending in the mailbox price.

Customers

What customers say

  • “That was the best infrastructure and value for money I saw.”
    Ido RebhunIdo RebhunRenaissance
  • “…deliverability with your inboxes is better than our outlook/google inboxes…”
    Daniel DultsinDaniel DultsinControl
  • “We really would like to thank you for that report. We don’t know what we are doing with email and it is very reassuring to us to know we have a partner on top of the ball.”
    ReilcapBill OConnorReilcap

Switching

Switching from Maildoso

  1. Create SMTP/IMAP mailboxes in Outreach2day, the same type as Maildoso's, on new domains bought in the app

  2. Warmup runs from the first day; the Maildoso mailboxes keep sending while ours wait out the 14 days

  3. Move the full volume to the new mailboxes on day 14

  4. Keep your sequencer (Instantly and Smartlead connect with an API key, EmailBison takes a CSV) or send from our own sequencer

  5. Cancel Maildoso and ask for your domains; Maildoso says the transfer is free at the end of the subscription

FAQ

Maildoso alternatives: questions

What is the cheapest Maildoso alternative?

Outreach2day, priced for the same cold volume: $150 a month for 100 mailboxes with warmup and sending. Maildoso with an Instantly plan for warmup and sending comes to $514.50.

Which Maildoso alternatives include warmup?

Outreach2day, Zapmail, Instantly and Smartlead. InboxKit sells it as a $3 add-on; Mailforge sells it as Warmforge.

Does any Maildoso alternative sell Google Workspace mailboxes?

Yes: Zapmail, InboxKit and Premium Inboxes sell Google Workspace and Microsoft 365, Instantly sells Google accounts, and Smartlead resells Google mailboxes as SmartSenders. Maildoso's Google Workspace page says it is not offering new Google Workspace mailboxes at the moment.

Can I keep my sequencer if I leave Maildoso?

Yes. Instantly and Smartlead connect to our mailboxes with an API key, and EmailBison is one of 12 more tools that get a CSV in their own import format. Our warmup keeps running while your sequencer sends.

Can I take my domains with me when I leave Maildoso?

Yes. Maildoso registers the domains it sells and manages them while it services them; its pricing page says it transfers them at no charge at the end of the subscription.

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. Mailboxes are $1.50 from 100 and $0.50 from 1,000; for larger volumes we size an Enterprise plan with you.

  • 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
  • Larger volumes: the Enterprise plan and its price for your setup

Free call

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

Or open the booking page

Related

More comparisons and guides

Sources

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

Outreach2day
Maildoso
Mailforge
Zapmail
InboxKit
Premium Inboxes
Instantly
Smartlead

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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