Sending Emails: How to Remove the X-Authentication Warning

Here is the header that appears in emails that your web server has sent through sendmail or postfix:
X-Authentication-Warning: apache set sender to using -f 

The reason is that you haven't told your mail server to trust apache as a sender. To fix it, edit the file /etc/mail/trusted-users by adding apache to the list.

Reference: Fix for X-Authentication-Warning - HowtoForge Forums | HowtoForge - Linux Howtos and Tutorials.


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