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What are Email Protocols (POP3, SMTP and IMAP) and their default ports
Setting up Email Clients with POP3, IMAP, and SMTP
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What are Email Protocols (POP3, SMTP and IMAP) and their default ports
587 – This is the port IANA registered as the secure SMTP port, and it requires an. explicit TLS connection. However, if the email server does not support TLS, the message will be sent in plain text
Port 465 works over an implicit SSL connection and if the server does not support it, the operation will be abortedAn IMAP server typically listens on well-known port 143, while IMAP over SSL/TLS (IMAPS) uses 993. Incoming email messages are sent to an email server that stores messages in the recipient's email box.
Originally, the Simple Mail Transfer Protocol (SMTP) used port 25. Today, SMTP should instead use port 587 — this is the port for encrypted email transmissions using SMTP Secure (SMTPS). Port 465 is also used sometimes for SMTPS. However, this is an outdated implementation and port 587 should be used if possible.
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