This article explains the most commonly used Email protocols on the internet – POP3, IMAP, and SMTP
- SMTP 25, 2525
- SMTP-SSL/TLS 587,465
- IMAP 143
- IMAP-SSL/TLS 993
- POP3 110
- POP3-SSL/TLS 995
587 vs. 465
These port assignments are specified by the Internet Assigned Numbers Authority (IANA):
Port 587: [SMTP] Message … Read more