I think it's a good idea to be able to add reason, when I add a email or IP address in postfix blacklist. I trying to add [email protected] as blacklist sender and send from this mail. When send mail I received mail on [email protected] from mailer demon: said: 554 5.7.1 <[email protected]>: Sender address rejected When opening ispconfig db and find [email protected] I add after REJECT (spacekey)You are banned. REJECT You are banned. and update table. When send new messege from [email protected] mailer demon said: 554 5.7.1 <[email protected]>: Sender address rejected: You are banned. Sorry for my bad english..