Emails from my Zen Cart stopped going through. Any emails I send from "Contact us" section on my Zen Cart are not going through at all.
Info
Zen Cart 1.5.1
Database Patch Level: 1.5.1
Server OS: Linux 2.6.18-371.6.1.el5
PHP Version: 5.4.40 (Zend: 2.4.0)
Database: MySQL 5.5.42-cll
Email Settings
E-Mail Transport Method PHP
E-Mail Linefeeds LF Info
Use MIME HTML When Sending Emails true Info
Send E-Mails true Info
Email Archiving Active? true Info
E-Mail Friendly-Errors false Info
Emails must send from known domain? Yes Info
Email Admin Format? HTML Info
How can I diagnose this?
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