Wasn't sure where to post this, but this is good information that everyone should know.
Yahoo recently changed their email policy to try and limit spam. This change has a side effect of bouncing all emails from yahoo.com addresses if the from field is yahoo.com and it is not sent through yahoo servers. As a result all email from the contact form and other forms on the website will bounce unless a setting is set in Zen Cart.
The setting is found in Configuration -> Email Options
Emails must send from known domain? should be set to YES. In addition please make sure the Email Address (sent FROM) is valid.
I STRONGLY encourage EVERYONE to make sure this setting is set now if you value your email being sent properly.
This should affect all versions of Zen Cart.
EDIT: For search reasons I'd like to point out that this was a result of a DMARC security policy change.
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