Email ports

The ports email uses to send and receive — SMTP, submission, IMAP, POP3 and their TLS variants. Which to use, and which to lock down.

9 ports in this category

Port	Service	Transport
25	SMTP (Simple Mail Transfer Protocol)	tcp
110	POP3 (Post Office Protocol v3)	tcp
143	IMAP (Internet Message Access Protocol)	tcp
465	SMTPS (SMTP Submission over implicit TLS)	tcp
563	NNTPS (NNTP over TLS)	tcp
587	SMTP Submission (STARTTLS)	tcp
993	IMAPS (IMAP over TLS)	tcp
995	POP3S (POP3 over TLS)	tcp
2525	SMTP submission (alternate)	tcp

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