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The SMTP tweak will prevent users from bypassing the mail server to send mail (this is a common practice used by spammers). It will only allow the MTA (mail transport agent), mailman, and root to connect to remote SMTP servers.

Steps

1. To access the SMTP Tweak feature, click on Security, on the main screen of your WebHost Manager interface.
2. Then click on Security Center.
3. Then click on SMTP Tweak.
4. Click on Configure in the SMTP Tweak section.
5. Click on the check box next to Allow Connections To localhost on Port 25 to allow users to connect to localhost on port 25.
6. Click on Enable to enable the SMTP tweak

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