We are using exchange 2013 with with one physical machine. We have been having some serious security problems so I signed up with a could based spam virus protections service Barracuda we also have a one of their appliances already on our network.
Changed my MX DNS records to make this work, Of course the attackers just went straight for my IP and bypassed the service.I reconfigured our firewall to only accept port 25 connections from the cloud service. It was a short lived calm our remote users cellphones
and tablets could not connect. I had to reopen the ports and we are back into the same boat. It's pretty bad. I would real like lock down port 25 again but I these remote users need their mail. We use outlook 2013 2016 and 2019 on the tablets the phones use
a number of clients including outlook. Anyone have any ideals as to how I can make this work.
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