EmailWarmup
EmailWarmup is a web and API service for warming mailboxes ahead of cold email.
What EmailWarmup is
EmailWarmup is a web and API service for warming mailboxes ahead of cold email. It pairs connected mailboxes with active peers, exchanging warmup messages in both directions. AI-generated subjects and replies use changing topics and tones, with a [WARMUP] tag in the subject. Users can choose slow, medium, or fast ramp-up schedules that gradually raise sending volume. Threaded replies, reads, stars, spam-folder rescue, and delivery checks support mailbox engagement. Gmail connects through OAuth; other mailbox connections can use SMTP/IMAP credentials. The service says these credentials are encrypted at rest, mailbox access is scoped to the user account, and personal email content is neither read nor stored. It says account data remains while an account is active and is removed within 30 days after deletion. A free plan is listed, and Starter is $19 a month. The maker says paid limits are enforced in the app, but billing is not yet connected and paid plans are enabled manually; Starter checkout is described separately as available through Dodo Payments. EmailWarmup does not send outreach campaigns, repair an already blocklisted domain, or guarantee inbox placement.
Good
- AI-generated warmup subjects and replies
- Slow, medium, and fast ramp-up options
- Supports multiple mailboxes and spam monitoring
- Offers web and API access
Watch out
- Does not guarantee inbox placement
- Cannot fix an already blocklisted domain
- Paid plans are enabled manually
- Starter checkout is described separately
Who it suits
It may suit founders, agencies, recruiters, sales teams, creators, and operators who want to warm mailboxes for cold email. It is not an outreach campaign sender.
Verdict
EmailWarmup combines automated mailbox exchanges, gradual ramp-up, and engagement actions in a service aimed at building sender reputation. Its stated limits and manual paid-plan setup are worth noting before choosing a plan.
Plans and prices
From EmailWarmup's own pricing page, checked 29 Sep 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Starter | $19 a month | 3 mailboxes · 100 warmup emails/day · up to 8 active peers/mailbox · 10 emails/day/campaign · premium matching |
| Growth | $49 a month | Unlimited mailboxes · 1,000 warmup emails/day · up to 25 active peers/mailbox · 25 emails/day/campaign · premium matching |
| Agency | $149 a month | Unlimited mailboxes · 3,000 warmup emails/day · up to 75 active peers/mailbox · 50 emails/day/campaign · API access ready |
| Community | — | 1 mailbox · 10 warmup emails/day · up to 3 active peers/mailbox · 3 emails/day/campaign · community matching |
| Enterprise | Priced on request | Unlimited mailboxes · 10,000 warmup emails/day · up to 200 active peers/mailbox · 100 emails/day/campaign · API access and support path |
The facts
Each one read from EmailWarmup's own pages, with the date it was checked.
What it does
- AI content
- AI-generated subjects and replies use rotating topics and tones and retain a [WARMUP] subject tag.checked 29 Sep 2026
- Credential security
- SMTP, IMAP, and OAuth credentials are encrypted at rest with Fernet, and mailbox access is scoped to the user account.checked 29 Sep 2026
- Data handling
- The privacy policy says account data is retained while an account is active and deleted account data is removed within 30 days.checked 29 Sep 2026
- Engagement
- The service supports threaded replies, reads, stars, spam-folder rescue, and delivery checks.checked 29 Sep 2026
- Intended users
- The homepage names founders, agencies, recruiters, sales teams, creators, and operators as audiences for the product.checked 29 Sep 2026
- Mailbox connections
- Users can connect Gmail with OAuth or use SMTP/IMAP credentials.checked 29 Sep 2026
- Paid access
- The pricing page says paid limits are enforced in the app, but billing is not connected yet and paid plans are enabled manually, with Starter checkout described separately as available via Dodo Payments.checked 29 Sep 2026
- Privacy
- The privacy policy says the service does not read or store personal email content and stores only AI-generated warmup email content.checked 29 Sep 2026
- Purpose
- EmailWarmup uses AI-generated warmup conversations and automated engagement to help build sender reputation for cold email.checked 29 Sep 2026
- Ramp-up
- Warmup speeds can be slow, medium, or fast, gradually raising sending volume over days.checked 29 Sep 2026
- Service limits
- The maker says the service does not send outreach campaigns, cannot fix an already blocklisted domain, and does not guarantee inbox placement.checked 29 Sep 2026
- Support
- The maker says support questions reach the people who write the code, and provides contact routes for support, privacy requests, and enterprise plans.checked 29 Sep 2026
- Warmup network
- Connected mailboxes are automatically paired bidirectionally with other active mailboxes, and messages are exchanged within the network.checked 29 Sep 2026
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