Sounds good for a small group of users, but I've got a few hundred users making connections from all over the country to this server to send their company email.
...I'm thinking this can't be done unless I get all of those users on VPN and then stop the world from connecting to my server on 25...
Oh ya, here's the third party stuff:
We use an outside email filtering service that sends cleaned emails to our server on port 25...but I guess even those 8 servers would have to be allowed through somehow, maybe I could let their servers connect without authenticating but nothing else...
I have relaying blocked in the SMTP settings by making my internet POP3/SMTP users authenticate. That's fine.
Now, can I make all connections to port 25 have to authenticate as well? Someone right now could use telnet to connect to my port 25 and send someone in the network an email.
I don't...
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