Sharing directories with system users: Private user groups, set group and umask
Sharing is caring and system users have feelings, too
Sharing is caring and system users have feelings, too
Postfix logs summarized for your reviewing pleasure
Additional postfix rules and tricks to slow down and frustrate spammers and evildoers
Using the Sieve plugin with Dovecot to filter and sort incoming email
Rspamd is the lesser evil when it comes to a choice of spam filters – or a choice between spam filters and spam
The easiest way to increase your odds of not getting rejected as a spammer when talking to other MTAs.
Encrypting MTA-to-MTA encryptions for private and secure relay of email
Quick-quitting, left-right-proportions and skinning