==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.6
- Linux/BSD distribution name and version: Ubuntu 16.04.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): mySQL
- Web server (Apache or Nginx): Apache
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

I have had to set up a couple of exceptions for local devices to successfully send email health reports as they cannot successfully logon. This is currently happening on Port 25 about which I am uncomfortable, so I have reversed the changes and set up a relay using a different mailserver which is only accessible from the local network to pass on the emails.

Is there a guide on how I can set up a custom SMTP port which can be made open to a restricted lan subnet which will not be available from the public network? It is a bit wasteful of resources having to run an extra server for just two devices ...

Thank you