Hi,

I understand that postfix send bounces or failed delivered notifications
using empty sender.

But does postfix accept empty sender emails during the MAIL FROM command
during the SMTP conversation? because i think that postfix needs a valid
email address ?

if postfix reject empty sender emails during receiving of emails, so how
come bounces and failed delivered notices are received from other email
servers ?

The reason i am asking for that in order to block some spam attacks on our
email mail server that using empty email senders

Thank you

Peter Michael

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