WarmInbox — Email Warmup

What it does

Most warmup tools charge $29/mailbox/month. WarmInbox gives you 3 mailboxes on the Starter plan for the same price — and 10 on Pro for $79. Connects via SMTP/IMAP, sends realistic human-like emails daily between a pool of real accounts, marks them as read, replies 40% of the time. Warmup score goes from 0 to 100 over 4 weeks. Works with Gmail, Outlook, and any custom domain. Free plan available — 1 mailbox, no credit card required.

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