Problem with php mail function bouncing emails back to postmaster.

A server I manage hosts around 200 sites each owned by different webmasters.  A number of these have form to mail style scripts.  A small problem is that the mailserver appears to be receiving emails from these scripts as anonymous@hostname.co.uk.   When an invalid email address is given on the form these bounces are going back to postmaster@hostname.co.uk.

I was asked to fix the scripts to ensure that the bounces go back to the $from field.  Here is a quick fix.

Append -f $to to the mail() line…  For example change

This

To this

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