Email problems

[eluser]eilrahc[/eluser]
In your first post, you said you got this error message:

"Message: mail() [function.mail]: SMTP server response: 501 5.5.4 Invalid Address"

This is the response that the remote mail server gave back to your script. It's Microsoft Exchange SMTP error message telling you that the program sending the email didn't properly identify itself during the handshake (specifically, the HELO/EHLO command). If you have access to the mail server, take a look at the logs and see what it's using. It can only be "HELO hostname.example.com" with the fully-qualified hostname and no trailing periods or spaces.

Have a look at this MS KB article for more info: http://support.microsoft.com/kb/291828