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EmailWarmup
What it is
EmailWarmup is a web and API service that uses automated mailbox conversations to help build sender reputation for cold email. Connected mailboxes are paired with active peers and exchange messages in both directions. AI generates subjects and replies with changing topics and tones, while messages retain a [WARMUP] subject tag. Users can choose slow, medium, or fast ramp-up schedules that raise sending volume gradually. The service supports threaded replies, reads, stars, spam-folder rescue, and delivery checks. Gmail connects through OAuth, while SMTP/IMAP credentials are another connection option. The maker says credentials are encrypted at rest, mailbox access is scoped to the user account, and personal email content is not read or stored. Account data is retained while an account is active and deleted data is removed within 30 days. The maker also says the service does not send outreach campaigns, fix already blocklisted domains, or guarantee inbox placement. A free plan is listed; Starter is $19.00 per month. Paid limits are enforced in the app, but billing is not connected yet and paid plans are enabled manually; Starter checkout is separately described as available through Dodo Payments.
For and against
For
- Mailbox pairs exchange messages in both directions.
- Ramp-up offers slow, medium, and fast options.
- Supports threaded replies, reads, and spam-folder rescue.
- Offers Gmail OAuth and SMTP/IMAP connections.
- Deleted account data is removed within 30 days.
Against
- Does not send outreach campaigns.
- Cannot fix an already blocklisted domain.
- Does not guarantee inbox placement.
- Paid plans are enabled manually while billing is not connected.
The verdict
EmailWarmup focuses on mailbox warmup and engagement rather than outreach delivery. Its manual paid-plan setup and lack of inbox-placement guarantees are important constraints to weigh.
Who it suits
EmailWarmup may suit founders, agencies, recruiters, sales teams, creators, and operators preparing mailboxes for cold email. It is not a service for sending outreach campaigns.
Plans and prices
Starter
3 mailboxes · 100 warmup emails/day · up to 8 active peers/mailbox · 10 emails/day/campaign
Read 29 Sep 2026 · emailwarmup.online
Growth
Unlimited mailboxes · 1,000 warmup emails/day · up to 25 active peers/mailbox · 25 emails/day/campaign
Read 29 Sep 2026 · emailwarmup.online
Agency
Unlimited mailboxes · 3,000 warmup emails/day · up to 75 active peers/mailbox · 50 emails/day/campaign
Read 29 Sep 2026 · emailwarmup.online
Community
1 mailbox · 10 warmup emails/day · up to 3 active peers/mailbox · 3 emails/day/campaign
Read 29 Sep 2026 · emailwarmup.online
Enterprise
Unlimited mailboxes · 10,000 warmup emails/day · up to 200 active peers/mailbox · 100 emails/day/campaign
Read 29 Sep 2026 · emailwarmup.online
On the record
- AI content
- AI-generated subjects and replies use rotating topics and tones and retain a [WARMUP] subject tag.emailwarmup.online · read 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.emailwarmup.online · read 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.emailwarmup.online · read 29 Sep 2026
- Engagement
- The service supports threaded replies, reads, stars, spam-folder rescue, and delivery checks.emailwarmup.online · read 29 Sep 2026
- Intended users
- The homepage names founders, agencies, recruiters, sales teams, creators, and operators as audiences for the product.emailwarmup.online · read 29 Sep 2026
- Mailbox connections
- Users can connect Gmail with OAuth or use SMTP/IMAP credentials.emailwarmup.online · read 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.emailwarmup.online · read 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.emailwarmup.online · read 29 Sep 2026
- Purpose
- EmailWarmup uses AI-generated warmup conversations and automated engagement to help build sender reputation for cold email.emailwarmup.online · read 29 Sep 2026
- Ramp-up
- Warmup speeds can be slow, medium, or fast, gradually raising sending volume over days.emailwarmup.online · read 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.emailwarmup.online · read 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.emailwarmup.online · read 29 Sep 2026
- Warmup network
- Connected mailboxes are automatically paired bidirectionally with other active mailboxes, and messages are exchanged within the network.emailwarmup.online · read 29 Sep 2026
