Create a test script
test.php
Upload the file to server, run it by going to urlCode:<?php mail("[email protected]","Testing","Testing"); echo "finished at " . time(); ?>
http://yourdomain.extn/test.php
See if it can send mail. Also check mail server log if there any entry when you access the page.
I only faced similar problem with wrong php.ini settings. So double check phpinfo show same setting for both sites.
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