I am talking about the authentication email, not MAIL FROM or RCPT TO.

hmm, when using the -v parameter, just above the "SASL LOGIN authentication 
failed: UGFzc3dvcmQ6" log entry, I can clearly see the email/password

thus postfix knows the email address being authenticated BEFORE the error 
message

so why not report the email, instead of a base64 string?




On Tue, 16 May 2023 07:52:08 -0400 (EDT) Wietse Venema via Postfix-users 
<postfix-users@postfix.org> wrote:

> You appear to believe that
> 
> - The Postfix SMTP server already knows the MAIL FROM or RCPT TO
> address when the remote SMTP client sends the AUTH command,
> 
> or that
> 
> - The Postix SMTP server can predict the future MAIL FROM or RCPT
> TO address when it receives the AUTH command.
> 
> That is not the case.
> 
>       Wietse
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