HELP! My email form is sending the following emails to my email inbox and I don't know what's causing it. It's probably an error in the PHP code or a problem with my host's server. A similar error was fixed on this form about a week ago and now this new problem. I'd like this fixed once and for all.
Here is the email:
SUBJECT: Mail Delivery Failed - returning message to sender
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
Please check all recipients of this 550 message to verify they are valid."