WarmForge vs MailWarm 2026: Which Warmup Tool Wins?

WarmForge charges $10/month per mailbox slot, billed quarterly, with the first slot free, and slots are unlimited and free outright if you already run Salesforge for outbound. MailWarm charges a flat $90/year for 50 inboxes on Basic, or $190/year for unlimited inboxes on Pro. Outside the Salesforge ecosystem, MailWarm's flat annual pricing is cheaper once you're warming more than a couple of mailboxes.

How Do WarmForge and MailWarm Pricing Compare in 2026?

WarmForge prices by mailbox slot starting at $10/month billed quarterly, with unlimited slots included free for Salesforge users. MailWarm prices flat per year regardless of team size: $90/year for up to 50 inboxes, $190/year for unlimited inboxes. The table below breaks down both, per each tool's own pricing page.

Tool	Plan	Price	Mailboxes	Standout Feature
WarmForge	Warm Up (per slot)	$10/month, billed quarterly (1st slot free)	1 mailbox per slot, unlimited slots free with Salesforge	AI-written warmup emails scored against a 0-100 Heat Score
WarmForge	Placement Tests (Pro)	$39/month, or $32.5/month billed annually	Up to 50 mailboxes	100 placement tests/month across connected mailboxes
MailWarm	Basic	$90/year flat	Up to 50 inboxes	Up to 40 warmup emails/day, P2P network with human review
MailWarm	Pro	$190/year flat	Unlimited inboxes	Up to 80 warmup emails/day, full automation

Which Tool Should You Actually Use?

WarmForge is the only sane pick if you're already paying for Salesforge. Slots are unlimited and included, so the warmup layer costs you nothing extra. Outside that ecosystem, $10/month per slot adds up fast once you pass 5 mailboxes, since MailWarm's $190/year Pro plan covers unlimited inboxes for less than two months of WarmForge slots at that volume.

MailWarm's real edge is flat pricing that doesn't punish scale. An agency warming 20 mailboxes pays the same $190/year on Pro as an agency warming 3. WarmForge's per-slot model means that same 20-mailbox agency pays roughly $200/month, over ten times more. WarmForge pulls ahead only when placement testing (checking where your emails actually land, not just warmup volume) matters more than raw mailbox count, since that's a separate paid tier MailWarm doesn't offer in the same form.

For agencies running cold email at real volume across many domains, MailWarm's flat annual pricing is hard to beat on cost. WarmForge earns its price only inside the Salesforge ecosystem or when placement testing is the priority.

What's the Real Difference in How They Warm Up Your Inbox?

WarmForge sends AI-generated warmup emails between your own connected mailboxes and scores each one with a Heat Score from 0-100, per WarmForge's pricing page, with health checks covering DNS records, MX records, and blacklist status. MailWarm routes your mailbox into a peer-to-peer network of other warmed inboxes with human review layered on top of full automation, per MailWarm's pricing page, sending up to 40 to 80 emails a day depending on plan.

Neither tool replaces a clean sending list or infrastructure that's set up correctly in the first place. Warmup fixes reputation over time. It doesn't fix a domain that was never authenticated right to begin with.

Frequently Asked Questions

Is WarmForge free if I already use Salesforge?

Yes. Per WarmForge's pricing page, Salesforge subscribers get unlimited mailbox warmup slots included at no extra cost. Without Salesforge, slots start at $10/month per mailbox, billed quarterly, with the first slot free.

How much does MailWarm cost for unlimited inboxes?

MailWarm's Pro plan is $190/year flat and covers unlimited inboxes at up to 80 warmup emails a day, per MailWarm's pricing page. The Basic plan is $90/year for up to 50 inboxes at a lower daily send cap.

Which tool is cheaper for an agency warming 20+ mailboxes?

MailWarm, by a wide margin. Its $190/year Pro plan covers unlimited inboxes flat, while WarmForge's per-slot pricing at $10/month per mailbox would run over $2,400/year for 20 mailboxes outside the Salesforge ecosystem.

Does either tool test inbox placement, not just send warmup volume?

WarmForge sells a separate Placement Tests plan starting at $39/month for 100 placement tests across up to 50 mailboxes. MailWarm's plans focus on warmup volume and P2P network health rather than a dedicated placement-testing product at the same depth.

Warmup tools fix inbox placement over time. They don't fix a list that's poorly targeted or copy that reads like a template. If you'd rather have someone handle deliverability, infrastructure, and sequencing end to end, that's what Modern Inbound's setup service does. We've booked 3,000+ qualified B2B meetings running outbound this way.

By Rishabh Ambasta, Founder, Modern Inbound.