Version 3.22
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1. Authenticators now have a new generic condition called server_mail_auth_
condition. When a client has authenticated, if it subsequently supplies an AUTH
value on a MAIL command, the value of this new option is expanded. If it yields
an empty string, "0", "no", or "false", the AUTH value is ignored. If the
expansion yields any other value, the AUTH value is retained and passed on with
the message. During the expansion, the address that was supplied by the AUTH
keyword is available in $authenticated_sender.

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