Well, since all the email routines in Zen Cart share a common code base, if only one of your pages is not working right, then either you've got something broken in custom coding or you've got a bad email address which is being rejected.
If you must attempt to diagnose email problems in your admin, then create a new file at /admin/includes/extra_datafiles/email_debug_on.php and put the following code in it:
Code:
<?php define('EMAIL_SYSTEM_DEBUG', 5);
Then try sending emails from your admin again. This should show all kinds of debug information on-screen when the email is sent. Note that it will interfere with other operations, so make sure you delete that file again when you've got your debug data.
Hopefully it will tell you more about the responses received from your mailserver.
If not, then you'll have to ask your webserver administrator why those emails are being rejected when attempting to send them.
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