Mailborder servers use various ports and protocols for handling web and email traffic. The required ports and protocols are listed below for Mailborder servers to function properly.
Inbound connections to services such as SSH or web can be controlled with a firewall, but outbound connections should not be restricted as doing so will either severely degrade server performance or break it all together. For example, many spam and virus updates are requested via ports 80 and 443 TCP.
Note that an inbound connection to the Master server from each Child server is required on port 443 TCP (https) for logging and task management.
Used on or Bound to Public Interface
*Enabling firewall access to 465 and 587 is optional.
Bound to Loopback Interface 127.0.0.1
Also outbound UDP 24441 for PYZOR
Thanks. Added it.