On 06/17/2015 09:00 AM, Michael Peter wrote: > 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 ? Null sender "<>" is a valid 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 ? You would have to force Postfix to do so, but that would affect all you described, so it doesn't sound like a good idea > > The reason i am asking for that in order to block some spam attacks on our > email mail server that using empty email senders That would require some analysis of common attributes of such spam in order to choose the most effective approach > > Thank you > > Peter Michael > Tomas
