InboxWarm.ai
InboxWarm.ai automatically warms Gmail, Outlook, and SMTP inboxes to build sender reputation, improve inbox placement, and reduce spam placement.
What InboxWarm.ai is
InboxWarm.ai automatically 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 replies and human-like sending patterns. The company describes its seed network as a private set of real inboxes. Its spam recovery engine marks warmup messages as not spam and moves them to the primary inbox when they reach 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. Every plan includes a public REST API with 30 endpoints; its default rate limit is 20 requests per minute per API key. The 10-day trial gives full warmup access for one email account without a credit card. InboxWarm says a full warmup typically takes about four to six weeks.
Good
- Supports Gmail, Outlook, and custom SMTP/IMAP.
- Includes SPF, DKIM, and DMARC monitoring.
- Every plan includes a 30-endpoint REST API.
- Trial includes one account without a credit card.
- Mailbox billing adjusts proportionally on the next invoice.
Watch out
- No free plan is listed.
- The 10-day trial covers only one email account.
- Default API limit is 20 requests per minute per key.
- Full warmup typically takes about four to six weeks.
Who it suits
InboxWarm.ai is intended for email teams ranging from startups to enterprises, including agencies, SaaS teams, and cold-email teams. It may suit users managing one or several inboxes who want warmup and deliverability monitoring.
Verdict
InboxWarm.ai combines automated inbox warmup with authentication monitoring, placement tracking, and API access. Its trial is limited to one account, and the monthly tier price depends on mailbox count.
Plans and prices
From InboxWarm.ai's own pricing page, checked 30 Sep 2026.
| Plan | Price | What it gives you |
|---|---|---|
| 51–100 mailboxes | $5 a month | 51–100 mailboxes · up to 100 warmup emails/day/inbox · monthly |
| 21–50 mailboxes | $6 a month | 21–50 mailboxes · up to 100 warmup emails/day/inbox · monthly |
| 6–20 mailboxes | $8 a month | 6–20 mailboxes · up to 100 warmup emails/day/inbox · monthly |
| 2–5 mailboxes | $11 a month | 2–5 mailboxes · up to 100 warmup emails/day/inbox · monthly |
| 1 mailbox | $15 a month | 1 mailbox · up to 100 warmup emails/day/inbox · monthly |
| Custom & enterprise | Priced on request | more than 100 inboxes · volume pricing · SLA agreements · dedicated onboarding |
The facts
Each one read from InboxWarm.ai's own pages, with the date it was checked.
What it does
- AI engagement
- The service sends, opens, and replies to warmup emails using LLM-generated contextual replies and human-like sending patterns.checked 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.checked 30 Sep 2026
- API limit
- The default API rate limit is 20 requests per minute per API key.checked 30 Sep 2026
- Authentication monitoring
- Plans include SPF, DKIM, and DMARC domain-health monitoring plus real-time inbox-placement tracking.checked 30 Sep 2026
- Integrations
- Supported sending setups include Gmail, Outlook, SendGrid, Amazon SES, Mailgun, Yahoo, and custom SMTP/IMAP.checked 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.checked 30 Sep 2026
- Seed network
- InboxWarm says its warmup uses a private network of real seed inboxes rather than bots or recycled accounts.checked 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.checked 30 Sep 2026
- Support
- InboxWarm says its support team is available 24/7 by email at [email protected].checked 30 Sep 2026
- Target customers
- The company describes its audience as ranging from startups to enterprises, including agencies, SaaS teams, and cold-email teams.checked 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.checked 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.checked 30 Sep 2026
Money
- Billing flexibility
- Users can add or remove inboxes from the dashboard, with billing adjusted proportionally on the next invoice.checked 30 Sep 2026
- Trial terms
- The 10-day trial provides full warmup access for up to one email account without a credit card.checked 30 Sep 2026
The company
- Founded
- 2026checked 28 Sep 2026
- Headquarters
- 8 The Green, STE A, Dover, DE 19901, USchecked 28 Sep 2026
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