If he changed nothing, then you may have changed something.

Try this.

Download and edit vars_mail.cgi. Delete the sendmail path line within it, and upload it to the server.

After doing so, enter email settings.

Is the path that is now in email settings the same as it was before?

--
Charles Capps
Programmer, Infopop Corporation
Please do not contact me privately for support - post on the board or open a support ticket instead!