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I'm using sendmail to send Mails from PHP and also forward some mails addressed to the server to a list of external mail-providers. The forwarding is done via an entry in /etc/mail/virtusertable:

test@domain.com testuser

In my /etc/aliases I include the mail list file:

testuser: ":include:/home/mail-list"

This setup works so far but I wanted to ask how it is possible to change the Reply-To Header of mails sent to the virtual user testuser via sendmail.mc? And if not is there another way to do this?

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  • Have you considered using some filtering e.g. via procmail script? It will help to filter out spam based on "email list specific bayes". It will allow you to add/replace any headers you like.
    – AnFi
    May 26 '18 at 13:57
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The proper way to set Reply-To is to do it in the MUA (PHP in your case), not in the MTA.

Example:

$to = 'bla@bla.com';
$subject = 'bla';
$message = 'bla';
$headers = 'From: webmaster@example.com' . "\r\n" .
    'Reply-To: webmaster@example.com' . "\r\n";

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

More info: http://php.net/manual/en/function.mail.php

If you insist on rewriting addresses through sendmail, you shall use genericstable (see http://www.sendmail.com/sm/open_source/docs/m4/features.html#genericstable)

  • Add the following lines to sendmail.mc and recompile it:

    GENERICS_DOMAIN('name.of.localhost')dnl

    FEATURE(`genericstable')dnl

  • create a map in /etc/genericstable to translate outgoing addresses. The file looks like this:

localuser newuser@newdomain

  • Convert the map to a hash db file by typing makemap hash /etc/genericstable.db < genericstable
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  • I may not have been very clear about this in my original post: The mails I'm forwarding are not sent by php but instead com from an external mail provider to the sendmail MTA. May 26 '18 at 6:32
  • updated answer with alternative solutions based on genericstable May 26 '18 at 22:45

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