What is IMAP? A Clear Guide

IMAP (Internet Message Access Protocol) lets email clients read and sync messages stored on a server, keeping mail consistent across devices.

Why it matters

Knowing IMAP helps you send mail that lands in the inbox. See the deliverability checklist.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus an AI watching list health and deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.