SASL


SMTP Authentication (SMTP Auth) provides an access control mechanism that can be used to allow legitimate users to relay mail while denying relay service to unauthorized users, such as spammers.

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SMTP Authentication (SMTP Auth) provides an access control mechanism that can be used to allow legitimate users to relay mail while denying relay service to unauthorized users, such as spammers.

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The Postfix Cyrus SASL support is used to authenticate remote SMTP clients to the Postfix SMTP server. Thanks to the Pluggable Authentication Modules (PAM) in Linux, we can configure Cyrus SASL to delegate the authentication process to an Active Directory server.

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Enabling SMTP authentication in Postfix ensures that only users with valid accounts can send email outside your network (relaying). This prevents spammers from using your SMTP server as a spam broadcast station. Here’s how to do it in Postfix.

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