April 12, 2024

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To Configure Mail Server We Need  SMTP, IMAP or POP3 :

SMTP – Simple Mail Transfer Protocol

IMAP – Internet Message Access Protocol

[OR]

POP3 – Post Office Protocol Version 3

Generally In CentOS We Use Mainly Two Services:
Postfix – SMTP,
Dovecot – IMAP / POP3.

SMTP Uses Ports 25(Smtp), 465(Smtps), 587(Submission)
IMAP Uses Ports 143(IMAP) , 993(IMAPS)
POP3 Uses Ports 110(POP3), 995(POP3S)