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== mechanisms in play ==* postfix - The mail transfer agent (MTA)* dovecot - The IMAP and POP3 service, how you retrieve your mail* 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.* saslauthd (SASL) - This is what authenticates you when you try to send an email. Rather than managing a relay list, SASL requires authentication before permitting the sending of email.