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InboxWarm.ai
8 The Green, STE A, Dover, DE 19901, US
What it is
InboxWarm.ai warms Gmail, Outlook, and SMTP inboxes to build sender reputation, improve inbox placement, and reduce spam placement. It sends, opens, and replies to warmup messages with LLM-generated contextual responses and human-like sending patterns. The company says it uses a private network of real seed inboxes; its spam recovery feature marks warmup messages as not spam and moves them to the primary inbox when they land in spam. Supported setups include Gmail, Outlook, SendGrid, Amazon SES, Mailgun, Yahoo, and custom SMTP/IMAP. Plans include SPF, DKIM, and DMARC monitoring plus real-time inbox-placement tracking. The public REST API has 30 endpoints and is included in every plan, with a default limit of 20 requests per minute per key. Monthly prices are $15 a month for one mailbox, $11 a month for 2–5, $8 a month for 6–20, $6 a month for 21–50, and $5 a month for 51–100. Each listed tier allows up to 100 warmup emails per inbox daily. A 10-day trial covers one account without a credit card. InboxWarm says a full warmup typically takes four to six weeks.
For and against
For
- Supports Gmail, Outlook, and custom SMTP/IMAP.
- Includes a public REST API in every plan.
- Trial includes one account without a credit card.
- Includes SPF, DKIM, and DMARC monitoring.
Against
- No free plan is listed.
- Default API limit is 20 requests per minute per key.
- A full warmup typically takes four to six weeks.
The verdict
InboxWarm.ai combines inbox warmup with spam recovery, placement tracking, authentication monitoring, and API access. Its trial is limited to one email account, and monthly pricing varies with mailbox count.
Who it suits
InboxWarm.ai suits cold-email teams, agencies, SaaS teams, and other organizations managing sender reputation across one or more mailboxes. It may also suit teams that want API access and domain-health monitoring alongside inbox warmup.
Plans and prices
51–100 mailboxes
51–100 mailboxes · up to 100 warmup emails/day/inbox
Read 30 Sep 2026 · inboxwarm.ai
21–50 mailboxes
21–50 mailboxes · up to 100 warmup emails/day/inbox
Read 30 Sep 2026 · inboxwarm.ai
6–20 mailboxes
6–20 mailboxes · up to 100 warmup emails/day/inbox
Read 30 Sep 2026 · inboxwarm.ai
2–5 mailboxes
2–5 mailboxes · up to 100 warmup emails/day/inbox
Read 30 Sep 2026 · inboxwarm.ai
1 mailbox
1 mailbox · up to 100 warmup emails/day/inbox
Read 30 Sep 2026 · inboxwarm.ai
Custom & enterprise
more than 100 inboxes · volume pricing · SLA agreements · dedicated onboarding
Read 30 Sep 2026 · inboxwarm.ai
On the record
- AI engagement
- The service sends, opens, and replies to warmup emails using LLM-generated contextual replies and human-like sending patterns.inboxwarm.ai · read 30 Sep 2026
- API
- The public REST API provides 30 endpoints for email accounts, warmup, deliverability, reports, spam tests, and system functions, included in every plan.inboxwarm.ai · read 30 Sep 2026
- API limit
- The default API rate limit is 20 requests per minute per API key.inboxwarm.ai · read 30 Sep 2026
- Authentication monitoring
- Plans include SPF, DKIM, and DMARC domain-health monitoring plus real-time inbox-placement tracking.inboxwarm.ai · read 30 Sep 2026
- Billing flexibility
- Users can add or remove inboxes from the dashboard, with billing adjusted proportionally on the next invoice.inboxwarm.ai · read 30 Sep 2026
- Integrations
- Supported sending setups include Gmail, Outlook, SendGrid, Amazon SES, Mailgun, Yahoo, and custom SMTP/IMAP.inboxwarm.ai · read 30 Sep 2026
- Security
- InboxWarm says credentials are encrypted end-to-end, never stored in plain text, and can be deleted with account data from the dashboard.inboxwarm.ai · read 30 Sep 2026
- Seed network
- InboxWarm says its warmup uses a private network of real seed inboxes rather than bots or recycled accounts.inboxwarm.ai · read 30 Sep 2026
- Spam recovery
- Its spam recovery engine marks warmup messages as not spam and moves them to the primary inbox when they land in spam.inboxwarm.ai · read 30 Sep 2026
- Support
- InboxWarm says its support team is available 24/7 by email at [email protected].inboxwarm.ai · read 30 Sep 2026
- Target customers
- The company describes its audience as ranging from startups to enterprises, including agencies, SaaS teams, and cold-email teams.inboxwarm.ai · read 30 Sep 2026
- Trial terms
- The 10-day trial provides full warmup access for up to one email account without a credit card.inboxwarm.ai · read 30 Sep 2026
- Warmup timeline
- InboxWarm says a full warmup typically takes about four to six weeks, with measurable improvement often appearing within two to three weeks.inboxwarm.ai · read 30 Sep 2026
- What it does
- InboxWarm.ai automatically warms Gmail, Outlook, and SMTP inboxes to build sender reputation, improve inbox placement, and reduce spam placement.inboxwarm.ai · read 30 Sep 2026
