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pop3

RFCs

RFC 2449: POP3 Extension Mechanism

Alaa 14 July 2026

Defines the CAPA command that lets POP3 clients discover server capabilities.

RFCs

RFC 1734: POP3 Authentication Command

Alaa 14 July 2026

Defines the AUTH command for POP3, enabling SASL-based authentication methods beyond USER/PASS.

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 ...