How can I prevent users from bypassing the mail server to send mail?
Posted by - NA -, Last modified by Randi O on 26 October 2016 01:18 PM

Click the "Tweak Security" link under "Security". Click on the configure link under "SMTP Tweak" Check the box next to "Allow connections to localhost on port 25." and click apply. This will only allow the MTA (mail transport agent), mailman, and root to connect to remote SMTP servers.

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