Quick TIP: Postfix Reverse lookup
When your maillog on a CentOS/*EL machine looks like this: mail postfix/smtpd[19345]: connect from unknown[XXX.YYY.ZZZ.QQQ]
Tag: Postfix
ClamAV Milter
CentOS 7 – still discovering it. ClamAV & ClamAV Milter related things have changed a bit.
follow the logs
Well, on a high-traffic mail server we need to follow the server log, to look for possible issues. The “tail -f” method might just not be as good as we would want, text is going up too fast and web just can’t read that fast. A solution to that is…
modern days aliases
Asuming we have on a mail server(that hosts domain1.com) some external aliases, like user1@domain1.com has an alias for user1@domain2.com, which is hosted on a different server, probably on a different mail provider. Typically when a mail is sent to user1@domain1.com, it’s sender’s mail server sends the mail to the MX…
TIP: Make Postfix use less SQL connections
When you manage Postfix mail servers using SQL connections to find informations about usernames, mailbox/maildir locations on the disk you probably have in your main.cf something like : virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_domains_maps.cf virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf relay_domains = mysql:/etc/postfix/mysql_relay_domains_maps.cf But, this way, each process(postfix process) uses one MySQL connection.…