My php's mail() function just stopped working a short while ago. It's started returning FALSE.

I am not much of a sysadmin so please forgive my ignorance.

I set my php.ini send_path option to: "sendmail_path = /usr/sbin/sendmail -t -i" and restarted apache.

Then, I learnt how to test sendmail like so:

sudo /usr/sbin/sendmail -bv [email protected] [email protected]... deliverable: mailer esmtp, host example.com., user [email protected]

The example email is a real mail box.

I have also seen unknown user messages in the mail log.

Can anyone please help me debug this?

Cheers, Rim