Koala is a GUI application for Less, Sass, Compass and CoffeeScript compilation, to help web developers to use them more efficiently. Koala can run in windows, linux and mac.
powermta config file link

Powermta Config File Link -

<domain-domA> domain example.com dkim-selector default dkim-private-key-file /etc/pmta/dkim/example.com.private pool pool-domA source-host mail.example.com max-msg 5000 max-simultaneous 20 throttle 100/s </domain-domA>

<domain *> bounce-to postmaster@yourdomain.com retry 5m 15m 1h 4h 1d </domain> powermta config file link

<domain-domB> domain example.net dkim-selector s1 dkim-private-key-file /etc/pmta/dkim/example.net.private pool pool-domB max-msg 2000 max-simultaneous 10 throttle 50/s </domain-domB> &lt;domain-domA&gt; domain example

<smtp-source mail.example.com> ip 203.0.113.5 </smtp-source> ip 203.0.113.5 &lt

<ip-pool pool-domB> ip 198.51.100.21 </ip-pool>