Send one invalid email response to sender
- by Kafuka
I discovered that my postfix/dovecot configuration isn't rejecting emails.  If a person sends an email to an invalid email-address, it just drops it.  I am fine with this behavior since I think it discourages spammers from mining emails (I have had some success).  Recently a person I did not want to talk to emailed an address I cut off and didn't receive a response back.  It would have saved me some problems if they knew to call me instead of sending 50+ emails.  How would I configure Dovecot/postfix to send a message back to a sender of an email address and then limit this 1 per domain or unique email.  
Debian Stable
Linux 3.6.5-linode47 
Dovecot 1.2.15
Postfix 2.7.1
PSQL - backend if that matters