MUST READ - All Mail from yahoo.com to yahoo.com bounced unless this setting is set.

[llynix]

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.

[RodG]

Why would a store owner want the emails to be sent with a from
address with anything but thier own domain name anyway?

Seriously, would you want to purchase from a store that is using john @ yahoo. com for their contact details?

Cheers,
RodG

[schoolboy]

Using 3rd-party domains as your basis for email is (as Rod points out) perhaps the most amateurish approach to customer communication. It's p1ss easy to set up domain-specific email boxes - and it says volumes (better image) to customers.