blocking domains in /etc/postfix/access
https://www.linuxquestions.org/questi...3/how-to-block-domains-postfix-684924
handy perl script to make sense of postfix log files to see what's going on.
http://adminlogs.info/2012/07/22/how-...tatistics-from-your-postfix-mail-logs
-
https://help.ubuntu.com/community/PostfixCompleteVirtualMailSystemHowto