A paranoid configuration could add:
smtpd_reject_unlisted_sender = yes
That is, do not send mail with a sender address that is known to
be invalid (the SMTP server would reject mail for the address with
"user unknown").
For more details (what is valid, why reject invalid senders) see
https://www.postfix.org/postconf.5.html#smtpd_reject_unlisted_sender
Wietse
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