Fix for X-Authentication-Warning: .. apache set sender to using -f

Like many people I love to send mail from PHP using apache! But when I do a tail -f of my mail logs I can see many “X-Authentication-Warning”‘s. I don’t like to see warnings in my logs and I read rumors on the net that this also affects the deliverability of your mail.. which is bad!

Anyway to fix this you just need to add apache as a trusted user in the trusted users list at /etc/mail/trusted-users

After opening that file and adding apache on its own line the error message vanishes 😀