eMail problem FROM:
 

I have not been able to send emails from my site because my host says that "On our shared servers we require that all outgoing mail sent via Sendmail and PHP mail() reference an email address under a domain hosted on the server in the FROM header."

When someone sends me an email their email address shows up in the FROM header and can not be delivered (e.g. anyuser@yahoo.com)

If I manually put in an email address from my site in the contact form it goes OK (example: FROM: contact@mywebsite.com)

In wordpress you can force all emails to go FROM any address you chose.

How do you do that in Vbulletin?