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