How to troubleshoot emails not sending out

First thing to check when no emails are being sent or you're not getting any emails from your pbx, is to ssh to your pbx and login as root and check /var/log/maillog file

Another thing to check is the email address, say, you need to check the MX Entry for in the dns zone with your registrar, make sure it is setup correctly and correspond to whatever showing up in the above /var/log/maillog

2nd thing to check is make sure your pbx IP is in the whitelist of the email server for and check the spam filter/folder of email server to make sure you can receive emails from your PBX IP.

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