flush deferred messages in mail queue
In Exim: # exim -qff In Postfix: # postfix flush In Sendmail: # sendmail -q -v
postfix: analyse logs using pflogsumm
pflogsumm is a great tool to quickly analyse Postfix log files. To install it: // Debian based distros # apt get install pflogsumm You can also it directly from the…
Disable IPv6 in linux
When some devices of your network don't support IPv6 (like your ISP routers!), then it's probably better to disable IPv6 on your linux hosts. It's worth noting that some applications…