Assuming you're using Sendmail with root access to the server.
Assuming you're using Sendmail with root access to the server: I've tested the result on my server where Sendmail is basically in it's factory configuration: mail($email, $subject, $message, $headers, '-freturn@address'); When using -f, Sendmail must know that you are a trusted user. You must add the server user to /etc/mail/trusted-users. For example, if the web server user is apache or www-data, you must put that into the trusted-users file.
Once you've done this, you probably have to enable the feature. Edit /etc/mail/submit. Mc and add the following line properly: FEATURE('use_ct_file')dnl Once you're done service sendmail restart should do the job.
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