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* postfix - The mail transfer agent (MTA)* postfix - The mail transfer agent (MTA), the boss.* dovecot - The IMAP and POP3 service, how you retrieve your mail* dovecot - The IMAP and POP3 service, how you retrieve your mail. The [[Postfix mailer and Dovecot]] are a team for accepting and delivering email.* pam (pam.d) - Linux Pluggable Authentication Modules (PAM) is what authenticates you when you try to login to get your mail from dovecot. PAM handles authentication.* pam (pam.d) - Linux [[Pluggable Authentication Modules (PAM)]] is what authenticates you when you try to login to get your mail from dovecot. PAM handles authentication.[[Category:Computer_Technology]][[Category:Linux]]