Good day.
I have a issue with incoming emails when our main fiber is offline(lots of fiber cuts).
I have 3 providers.
The main fiber, a backup line and a line I use for services(Voip, DNS, Outgoing mail).
The issue is, the backup line has been provided to us for free, and is behind a firewall.
So what happens is that most of the clients are unable to connect to mail servers on port 110 because it is being filtered at the firewall side, removing the firewall rules is not an option.
I first created a rule that puts all mail server addresses on port 110 into a address list, then I created a routing mark for those addresses and added a route to the 3rd provider.
Issue is, it doesn’t seem to be working correctly.
Outgoing mail routes correctly but incoming is still a issue.
Do you have any suggestions?
I cannot put every client on the 3rd line because there is not enough bandwidth.