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The Email Wiki

imap

RFCs

RFC 2177: IMAP4 IDLE Command

Alaa 22 July 2026

Defines the IDLE extension that lets an IMAP client be notified of new mail in real time without polling.

RFCs

RFC 4551: IMAP Extension for Conditional STORE Operation

Alaa 22 July 2026

Defines CONDSTORE, atomic flag updates with change detection to prevent race conditions in concurrent IMAP clients.

RFCs

RFC 6851: The IMAP MOVE Extension

Alaa 22 July 2026

Defines the MOVE command for atomically moving messages between IMAP folders without a COPY+EXPUNGE sequence.

Email Glossary

Email Protocols and Ports in 2026: SMTP, IMAP, POP3, OAuth2 Requirements and TLS Configuration

Alaa 28 August 2026

SMTP, IMAP, and POP3 protocols and ports for email: 25/465/587 for SMTP, 993 for IMAP, 995 for POP3. Covers STARTTLS vs implicit TLS, OAuth2 requirements for Gmail Workspace and Microsoft 365, POP3 ...