How this page was made. Every figure was read from each vendor's own pages on 19 September 2026 and is linked at the bottom. emailcampaign.ai is the third column and the publisher of this page; where MailReach or Warmbox is the better choice, the page says so. Prices change; check the linked pages before buying.
MailReach and Warmbox both sell one thing: warm-up for mailboxes you already have. MailReach prices per mailbox at $19.50 to $25 and adds a spam test; Warmbox prices per bundle, one inbox for $19, three for $79, six for $159. The comparison is arithmetic first and network quality second, and the third column is there because warm-up is increasingly included in the sending platform rather than bought separately.
Side by side
| MailReach | Warmbox | emailcampaign.ai | |
|---|---|---|---|
| Starting price | $19.50 to $25 a mailbox a month (the page and MailReach's own blog differ) | $19 a month ($15 annual) for one inbox and 50 emails a day; $79 for three; $159 for six | Free 14-day trial; Basic $39 a month; Pro $94 a month |
| Pricing model | Per mailbox; spam-test credits in packs; agency pricing on request | Per bundle of inboxes and daily emails; enterprise on request; no free trial | Plan by emails per month; unlimited mailboxes and warm-up on every plan; infrastructure at cost plus $5 setup per mailbox |
| Provisions mailboxes and domains | No | No | Yes: domains (about $12 a year), Google Workspace seats ($8.40 a month), Microsoft 365 seats at Microsoft's rate, or self-hosted servers from $39 a month; you own the domains and accounts |
| DNS | Checks only (SPF, DKIM, DMARC, blacklists) | A DNS and blacklist checker | SPF, DKIM (selectors read from the provider), DMARC and postmaster records written through the registrar and shown before they go live |
| Warm-up | Is the product: a network described as 30,000 real inboxes, up to 100 warm-up emails a day, Google, Microsoft 365 and transactional providers | Is the product: a network described as 35,000 private inboxes, Growth, Flat and Random modes, most providers and any SMTP | Included, unlimited, with a maintenance level after the ramp; never reaches your inbox |
| Placement test | Yes, 30-plus seed mailboxes, three free tests a day | None | Yes, per mailbox at Gmail and Outlook |
| White-label | None; an agency dashboard with tags | None; multi-account for agencies | Yes: a complete webmail and admin console on the client's own domain, plus dashboard branding |
| Reviews | G2 4.7 from about 34 to 41; Capterra 5.0 from 24 | No G2 or Capterra listing found; Product Hunt reviews are low | New listing; reviews being gathered |
| Best for | Teams that keep their sequencer and only want warm-up and spam tests | One or two mailboxes on a provider other tools do not support | Teams that want the mailboxes, domains, DNS and warm-up done for them behind one approval, and agencies that need a client-branded door |
| Watch out for | Per-mailbox cost adds up on a fleet, no native Instantly or Smartlead integration, and a Trustpilot review reports a cancelled subscription reactivating | Bundles cap inboxes hard, so a growing fleet jumps tiers; Product Hunt reviewers report mail still landing in spam after warm-up | The recommended 8 to 10 sends a day per mailbox means volume comes from fleet size; if you want 100 a day from one mailbox, nothing here will let you |
Where MailReach is stronger
The placement test. Thirty-plus seed mailboxes, three free tests a day, spam-test credits in packs; Warmbox has no placement test.
Provider coverage stated plainly: Google, Microsoft 365 and transactional providers, up to 100 warm-up emails a day, a network described as 30,000 real inboxes.
Reviews exist. G2 4.7 from about 34 to 41 reviews and Capterra 5.0 from 24; Warmbox has no G2 or Capterra listing we could find, and its Product Hunt reviews are low.
Where Warmbox is stronger
Any SMTP. Warmbox connects most providers and any SMTP server, with Growth, Flat and Random sending modes; that suits one or two mailboxes on a provider other tools do not list.
Price for one mailbox. $19 a month, or $15 billed annually, for one inbox and 50 emails a day, against MailReach's $19.50 to $25.
A DNS and blacklist checker is built in.
Where emailcampaign.ai fits
emailcampaign.ai is not a standalone warm-up tool; warm-up is included for every mailbox on the platform, unlimited, with a maintenance level after the ramp, and placement tests at Gmail and Outlook per mailbox. For a fleet that is the arithmetic that matters: ten mailboxes cost $195 to $250 a month at MailReach, need enterprise pricing at Warmbox, and are covered by the $39 Basic plan here. The trade is that you move sending here too, and each mailbox is held at 8 to 10 cold emails a day.
Decide by the question you are asking
- “One or two mailboxes on an unusual provider.” Warmbox.
- “Warm-up plus a real placement test, sequencer unchanged.” MailReach.
- “A fleet of ten or more.” emailcampaign.ai if you will send from it; otherwise MailReach, budgeted per mailbox.
- “We use Instantly or Smartlead already.” Both include their own warm-up; MailReach has no native integration with either.
- “We need proof, not a feature.” Run MailReach's free tests before and after any warm-up, including ours.
Sources: MailReach: Pricing · MailReach: Warm-up · MailReach: Spam test · Warmbox: Pricing · Warmbox: Warmbox · emailcampaign.ai: Pricing · emailcampaign.ai: Infrastructure ·
Questions, answered straight
- How much does warm-up cost for ten mailboxes?
- MailReach: $195 to $250 a month at the per-mailbox price. Warmbox: the six-inbox bundle is $159 and ten needs enterprise pricing on request. emailcampaign.ai: included in the $39 Basic plan with unlimited mailboxes, because sending runs here as well.
- Does either provision mailboxes?
- No; both warm what you connect. emailcampaign.ai creates the mailboxes, Google Workspace, Microsoft 365 or self-hosted, in your name and warms them.
- What do the complaints say?
- MailReach: per-mailbox cost on a fleet, no native Instantly or Smartlead integration, and one Trustpilot report of a cancelled subscription reactivating. Warmbox: bundles cap inboxes hard so a growing fleet jumps tiers, and Product Hunt reviewers report mail still landing in spam after warm-up.
Published 19 September 2026. Updated 19 September 2026. Written by the team that runs the infrastructure; numbers come from the platform's own provisioning and sending, and from the providers' published documentation at the time of writing.