InboxKit alternatives: warmup and sending included, $146 a month less at 2,500 cold emails a day

InboxKit charges $3 per Google or Microsoft mailbox a month on monthly billing and $3 more per mailbox for warmup. It has no sequencer. Outreach2day charges $2.50 a mailbox month to month with warmup and a sequencer included: $150 for 2,500 cold emails a day against $296 for 63 InboxKit mailboxes at 40 a day each plus an Instantly plan. We make Outreach2day and rank it first. Below, 7 InboxKit alternatives with warmup, billing terms and the full cost.

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: $296
  3. ZapmailZapmail: $406
  4. MailforgeMailforge: $434
  5. MaildosoMaildoso: $524.50
  6. SmartleadSmartlead: $544
  7. InstantlyInstantly: $607
  8. Premium InboxesPremium Inboxes: $691.50
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

Ranked

7 InboxKit alternatives, ranked

Why each one is an alternative to InboxKit, 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: warmup and a sequencer included, monthly billing

    The mailbox, its warmup (25+ warmup emails a day to Google recipients, 25 to Outlook, 25 to other providers) and the sequencer are one $2.50 line. Leaving InboxKit for us removes two bills: the $3 warmup add-on and the sequencer. Our mailboxes run on our own infrastructure and land in the inbox. They sync to Instantly or Smartlead if you keep one.price source

    Included Warmup includedIncluded Sending included

    Full setup

    $150 / mo

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

  2. 2. Zapmail: Google and Microsoft mailboxes with warmup handled

    Zapmail sells Google Workspace and Microsoft 365 at the same prices in plans of 10, 30 and 100, and its FAQ says it handles warmup. There is no sequencer, and Zapmail gives no refunds.price source (opens the vendor's page in a new tab)

    Included Warmup includedNot included Sending not includedZapmail alternatives

    Full setup

    $406 / mo

    2,500 cold emails a day · Mailboxes

  3. 3. Premium Inboxes: done-for-you Google and Microsoft inboxes

    Premium Inboxes builds the inboxes, checks DNS by hand and uploads them to your sequencer, with free replacements. Per inbox it costs more than InboxKit ($3.50 under 250 inboxes), and warmup runs in 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 includedPremium Inboxes alternatives

    Full setup

    $691.50 / mo

    2,500 cold emails a day · Mailboxes

  4. 4. Mailforge: SMTP slots inside the Forge products

    If you are moving off Google and Microsoft to cut cost, Mailforge sells shared-IP SMTP slots from $3 a month. Warmup is Warmforge and sending is Salesforge, each a separate subscription.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

  5. 5. Maildoso: SMTP mailboxes at $2.50 for teams with a sequencer

    Maildoso's plan is $2.50 a mailbox a month, but each mailbox sends up to 15 cold emails a day, warmup comes from another tool, and the plan starts at 30 mailboxes.price source (opens the vendor's page in a new tab)

    Not included Warmup not includedNot included Sending not includedMaildoso alternatives

    Full setup

    $524.50 / mo

    2,500 cold emails a day · Mailboxes

  6. 6. Instantly: Google accounts bought inside the sequencer

    Instantly sells done-for-you Google accounts at $5 a month on top of its plan, with warmup in the plan. The accounts work only inside Instantly, and Instantly keeps the domains.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

    $607 / mo

    2,500 cold emails a day · Sequencer + mailboxes

  7. 7. Smartlead: Google, Outlook and SMTP mailboxes inside Smartlead

    SmartSenders are Google and Outlook mailboxes at $4.50, resold from Zapmail and InfraInbox, plus SMTP from $3.99. They stay inside Smartlead, and the Smartlead plan is extra.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. $2.50 against $3 a month

    InboxKit's mailbox is $3 a month on monthly billing. Ours is $2.50 month to month up to 99 mailboxes, $1.50 from 100 and $0.50 from 1,000.

  2. Warmup inside the $2.50

    InboxKit's warmup costs $3 per mailbox a month, as much as the mailbox. At 100 mailboxes that is $300 a month. Ours runs on every mailbox inside the $2.50.

  3. A sender in the same bill

    InboxKit exports to 24+ sequencers, and you pay one of them. Campaigns, sequences and a reply inbox are part of our subscription.

InboxKit sells Google Workspace, Microsoft 365 and Azure mailboxes with no minimum. Ours are SMTP/IMAP from 12 mailboxes.

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: $155
  3. ZapmailZapmail: $198.50
  4. InstantlyInstantly: $232
  5. Premium InboxesPremium Inboxes: $254
2,500 a day · 55,000 a month100 of our mailboxes; others at their own limit · USD a month
  1. Outreach2dayOutreach2day: $150
  2. InboxKitInboxKit: $296
  3. ZapmailZapmail: $406
  4. InstantlyInstantly: $607
  5. Premium InboxesPremium Inboxes: $691.50
10,000 a day · 220,000 a month400 of our mailboxes; others at their own limit · USD a month
  1. Outreach2dayOutreach2day: $600
  2. InboxKitInboxKit: $1,031
  3. ZapmailZapmail: $1,480
  4. InstantlyInstantly: $2,194
  5. Premium InboxesPremium Inboxes: $2,282

  • 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

  • ZapmailMailboxes

    625 a day13,750 a month
    $198.50 / moZapmail Starter + 15 extra mailboxes $91.50 + Instantly Hypergrowth $107
    2,500 a day55,000 a month
    $406 / moZapmail Pro (100 mailboxes) $299 + Instantly Hypergrowth $107
    10,000 a day220,000 a month
    $1,480 / moZapmail Pro + 300 extra mailboxes $1,199 + Instantly Hypergrowth + 2 Outbound add-ons $281

  • Premium InboxesMailboxes

    625 a day13,750 a month
    $254 / mo42 inboxes × $3.50 (15 a day each) $147 + Instantly Hypergrowth $107
    2,500 a day55,000 a month
    $691.50 / mo167 inboxes × $3.50 (15 a day each) $584.50 + Instantly Hypergrowth $107
    10,000 a day220,000 a month
    $2,282 / mo667 inboxes × $3.00 (15 a day each) $2,001 + Instantly Hypergrowth + 2 Outbound add-ons $281

  • InstantlySequencer + mailboxes

    625 a day13,750 a month
    $232 / mo25 Google accounts × $5 $125 + Instantly Hypergrowth $107
    2,500 a day55,000 a month
    $607 / mo100 Google accounts × $5 $500 + Instantly Hypergrowth $107
    10,000 a day220,000 a month
    $2,194 / mo400 Google accounts × $5 $2,000 + Instantly Hypergrowth + add-on $194

  • InboxKitMailboxes

    625 a day13,750 a month
    $155 / mo16 mailboxes × $3.00 (40 a day each) $48 + Instantly Hypergrowth $107
    2,500 a day55,000 a month
    $296 / mo63 mailboxes × $3.00 (40 a day each) $189 + Instantly Hypergrowth $107
    10,000 a day220,000 a month
    $1,031 / mo250 mailboxes × $3.00 (40 a day each) $750 + Instantly Hypergrowth + 2 Outbound add-ons $281

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 $431 a month ($5,172 a year)with Outreach2day at 10,000 cold emails a day, against the full InboxKit 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

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. Zapmail + InstantlyZapmail + Instantly: $4,066.83
  3. Premium Inboxes + InstantlyPremium Inboxes + Instantly: from $5,373.60
  4. Instantly + its done-for-you Google accountsInstantly + its done-for-you Google accounts: $5,956
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. Zapmail + InstantlyZapmail + Instantly: $8,036.58
  3. Premium Inboxes + InstantlyPremium Inboxes + Instantly: from $10,650.20
  4. Instantly + its done-for-you Google accountsInstantly + its done-for-you Google accounts: $11,815
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. Premium Inboxes + InstantlyPremium Inboxes + Instantly: from $21,287.60
  4. Instantly + its done-for-you Google accountsInstantly + its done-for-you Google accounts: $23,620
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
Zapmail + Instantly, Premium Inboxes + Instantly, Instantly + its done-for-you Google accounts, 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
Zapmail + Instantly, Premium Inboxes + Instantly, Instantly + its done-for-you Google accounts, 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
Zapmail + Instantly, Premium Inboxes + Instantly, Instantly + its done-for-you Google accounts, InboxKit + 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, Zapmail, Premium Inboxes, Instantly, InboxKit
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
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)
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)
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)
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
  • 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 Light Speed + 4 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 Light Speed + 11 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 Light Speed + 26 Outbound add-ons (sequencer, warmup) ($2,620) = $16,064.17
  • 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 Light Speed + 4 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 Light Speed + 11 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 Light Speed + 26 Outbound add-ons (sequencer, warmup) ($2,620) = from $21,287.60
  • 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

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 InboxKit, for the same 55,000 emails

  1. Outreach2dayall included
    Mailboxes with warmup and a sequencer included
  2. InboxKit more
    $3.00 per mailbox a month on monthly billing; warmup from the Instantly plan instead of the $3 add-on; sequencer with warmup, the full sending setup: Instantly's published plan for the emails and new contacts a month (Growth $47, Hypergrowth $107, Light Speed $358, Outbound add-ons $87 each)

Side by side

InboxKit and more options side by side

Vendors that sell Google and Microsoft mailboxes like InboxKit, plus ours: lowest published per-mailbox price, smallest order, warmup, API and MCP, 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 pay InboxKit's $3 warmup add-on and want warmup inside the mailbox price
  • You want $2.50 a mailbox month to month, $1.50 from 100 and $0.50 from 1,000
  • You want an MCP server for an AI assistant

Outreach2day does not fit if

  • You need 1 to 11 mailboxes
  • You want Azure-tenant Microsoft mailboxes at $30 for up to 100

InboxKit

InboxKit: what it charges, limits and who it fits

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

Pricing model

source (opens the vendor's page in a new tab)
A flat price per mailbox, the same for Google Workspace and Microsoft 365: $3.00 a month on monthly billing, $2.70 quarterly, $2.50 on annual billing. Sold per mailbox, with no minimum.

Azure

source (opens the vendor's page in a new tab)
Azure tenants are priced per tenant: $30 a month for up to 100 mailboxes.

Warmup

source (opens the vendor's page in a new tab)
An add-on at $3 per mailbox a month: a 14-day isolated warmup, then low ongoing volume alongside outreach.

Monitoring

source (opens the vendor's page in a new tab)
InfraGuard, an add-on with the first month free: blacklist, DNS, bounce-rate and inbox-placement checks every six hours, with alerts and auto-pause.

Sending

source (opens the vendor's page in a new tab)
No sequencer. One-click export to 24+ sequencers, including Instantly, Smartlead, lemlist and Apollo; API with webhooks on every plan.

Refunds

source (opens the vendor's page in a new tab)
Subscriptions are billed in advance and generally non-refundable, with no pro-rata refunds; domains are non-refundable once registered.

Read on .

What InboxKit is good at

Pick InboxKit if

  • You want Google Workspace or Microsoft 365 mailboxes one at a time, without a plan or a minimum.
  • You need Azure-tenant Microsoft mailboxes: $30 a month for up to 100.

Every InboxKit plan and add-on is in InboxKit 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

Check which InboxKit costs you would actually replace

Start with your current invoice: the mailbox line, the warmup add-on and the sequencer you send from. Those three lines are what a switch replaces.

Next, check where warmup runs today. A team already using the warmup in its sequencer should compare InboxKit's mailbox-only line, rather than adding the $3 warmup charge twice. A team paying InboxKit for warmup needs to include that add-on in the outgoing bill. Finally, check the renewal date before ordering replacements: prepaid annual service and a fresh monthly order can overlap while the new accounts warm up.

Maildoso, the SMTP option above, has its own list in Maildoso alternatives. So does Mailscale, another shared-IP SMTP seller, in Mailscale alternatives; its plans and refund terms are in the Mailscale review.

What InboxKit costs with warmup and a sender

The plans, warmup add-on and billing terms are in InboxKit pricing.

InboxKit's mailbox is $3.00 a month on monthly billing; longer prepaid terms cost less. Warmup is $3 per mailbox a month. InfraGuard monitoring is an add-on with the first month free. Subscriptions are billed in advance and generally non-refundable.

With the warmup in an Instantly plan instead of InboxKit's add-on: $155 at 625 cold emails a day (16 mailboxes at 40 a day), $296 at 2,500 and $1,031 at 10,000. With InboxKit's own warmup the mailbox line doubles: $600 a month at 100 mailboxes before a sequencer. Ours: $62.50, $150 and $600, all in.

Google and Microsoft mailboxes or ours

InboxKit sells Google Workspace and Microsoft 365 accounts. Most people think only Google gets to the inbox and overpay for it. Our mailboxes run on our own infrastructure and land in the inbox.

Test before you decide. Mail from the same mailbox can land in the inbox at Outlook and in spam at Gmail, whoever hosts it. Our mailboxes come with Google and Outlook placement tests, so you can compare them against your InboxKit mailboxes on the same copy.

Pick by the reason you are leaving InboxKit

The bill is too high: most of it is usually the warmup add-on and the sequencer. Outreach2day removes both; Maildoso and Mailforge lower the mailbox line but keep the sequencer.

You want a lower monthly price: our $2.50 is billed month to month against InboxKit's $3, and Maildoso's $2.50 is its monthly plan price from 30 mailboxes.

You want someone else to build and replace the inboxes: Premium Inboxes.

You want mailboxes and sending from one vendor and don't mind the lock-in: Instantly or Smartlead, whose own mailboxes stay inside their tools.

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 InboxKit

  1. Create mailboxes in Outreach2day on new domains. SPF, DKIM and DMARC are set automatically.

  2. Warmup starts on its own. Send no cold email from them for 14 days.

  3. Keep your InboxKit mailboxes sending while ours warm up; ours send up to 25 cold emails a day from day 14.

  4. Send from our own sequencer, or sync the new mailboxes to the sequencer you export InboxKit mailboxes to today.

  5. Cancel InboxKit at the end of its billing period. On annual billing, plan the switch for the renewal date: InboxKit gives no pro-rata refunds.

FAQ

InboxKit alternatives: questions

What is the cheapest InboxKit alternative?

For the full setup at 2,500 cold emails a day, Outreach2day at $150 a month, with warmup and a sequencer included. InboxKit plus an Instantly plan costs $296.

Does InboxKit include warmup?

No. Warmup is an add-on at $3 per mailbox a month: 14 days of isolated warmup, then low ongoing volume. Outreach2day includes warmup in the $2.50 mailbox.

Which InboxKit alternatives sell Google Workspace mailboxes?

Zapmail, Premium Inboxes and Instantly. Smartlead resells Google and Outlook mailboxes as SmartSenders. Outreach2day, Maildoso and Mailforge sell SMTP mailboxes.

How does InboxKit's price compare with Outreach2day's?

InboxKit's mailbox is $3 a month on monthly billing, and warmup is $3 more. Ours is $2.50 month to month with warmup and the sequencer included, $1.50 from 100 mailboxes and $0.50 from 1,000. The Enterprise plan has better prices; book a call.

What does InboxKit's InfraGuard add-on check?

Blacklists, DNS records, bounce rate and inbox placement every six hours, with alerts and auto-pause; the first month is free. Our per-mailbox warmup inbox, spam and bounce rates and the Google and Outlook placement tests come with the mailbox.

Does InboxKit have a minimum order?

No, you can buy one mailbox. Our minimum is 12 mailboxes, $30 a month.

Are InboxKit Microsoft 365 inboxes affected by MC1454397?

Per its pricing page in October 2026, InboxKit sells Microsoft 365 mailboxes at $3.00 a month on monthly billing and Azure tenants at $30 a month for up to 100 mailboxes; both run on Exchange Online. Microsoft's MC1454397 gives a new Exchange Online tenant 10% of its external recipient quota for its first 30 days and 25% until day 60, and a trial tenant 500 external recipients a day. The quota belongs to the tenant, so every mailbox in it draws on the same daily pool (Exchange Team Blog). These rules apply to Microsoft mailboxes from any seller. The dates and the quota math are in MC1454397 and the new-tenant limits; moving that volume to SMTP/IMAP mailboxes is covered in cold email off Microsoft 365.

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
InboxKit
Zapmail
Premium Inboxes
Instantly
Mailforge
Maildoso
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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