Email not working – How to set -f parameter for email

WordPress uses the PHP mail function. You can find that code in wp-includes/pluggable-functions.php.

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Thanks, my only problem now is to know exactly what to change and where to add the -f parameter in the code ??

I’ll be doing some testing by trial and error, but if anyone should happen to know what exactly parts of the code to change I’d be very happy to know, thanks.

In the article I mentioned above, https://us2.php.net/manual/en/ref.mail.php saw the trick of adding the -f parameter so this might work for you. So at approximately line 166 in wp-includes/pluggable-functions.php

change

return @mail($to, $subject, $message, $headers);

to
return @mail($to, $subject, $message, $headers, "-f [email protected]");

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Please note that modifying core files is generally discouraged, so make a backup of the file(s) before changing anything–just in case it doesn’t work you’ll have something to fall back on. Also, remember you will need to ‘retrofit’ that change upon subsequent WordPress upgrades.

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Thanks a lot for your help MichaelH! That did the trick. The wordpress mail now works, though I should probably look into a way to configure the server so mails without the -f parameter gets accepted for delivery (but configuring sendmail is quite a daunting task, to me at least ;-).

oh btw, I should note that there shouldn’t be a space between -f and the webmastermail (so it would be “[email protected]”), just in case someone else tries it.

Thanks for the ‘fix’ and I also forgot to mention this plugin that has worked for others:
https://www.coffee2code.com/archives/2004/06/28/plugin-wpphpmailer/