Me again
My host has washed their hands of the issue by taking this position. After years of service this just recently became a problem.

The system wont allow mail to be sent from nobody, mail needs to be from a real email address. This is important because spammers exploit systems and they use nobody@ to hide which account they exploited. The end result of not being able to properly track email from the server is it can end up blacklisted.

You will need to adjust your php scripts to send email using a valid email address. Generally most well written scripts will do this, sometimes there is a place in the web management portion to enter a email address to be used.

Another negative of nobody emails is they will generally end up in a spam box if spam filters are being used on the receiving account.

Can someone tell me where I would adjust the php scripts to ensure automated emails generated on registration, birthday congratulations etc are sent from a real address?

Thanks in advance for your help

Jay