Postfix SASL support (
RFC 2554) can be used to authenticate
remote SMTP clients to the Postfix SMTP server, and to authenticate
the Postfix SMTP client to a remote SMTP server.
When receiving mail, Postfix logs the client-provided username,
authentication method, and sender address to the maillog file, and
optionally grants mail access via the
When sending mail, Postfix can look up the server hostname or
destination domain (the address right-hand part) in a Postfix SASL password
table, and if a username/password is found, it will use that username
and password to authenticate to the server. And as of version 2.3,
Postfix can be configured to search its SASL password table by the
sender email address.
This document covers the following topics: