IMAP / POP3 and SMTP ports 

Protocol Security Setting Port Number(s)
SMTP (sending mail) Encrypted - TLS/STARTTLS 465
SMTP (sending mail) Encrypted - SSL 465
SMTP (sending mail) Unencrypted 25* (or 26)
POP3 (receiving mail) Encrypted - TLS 995
POP3 (receiving mail) Encrypted - SSL 995
POP3 (receiving mail) Unencrypted 110
IMAP (receiving mail) Encrypted - TLS 993
IMAP (receiving mail) Encrypted - SSL 993
IMAP (receiving mail) Unencrypted 143
Categories: SMTP