setting reply-to in sendmail.mc

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:

[email protected] 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?

Solution 1:

The proper way to set Reply-To is to do it in the MUA (PHP in your case), not in the MTA.

Example:

$to = '[email protected]';
$subject = 'bla';
$message = 'bla';
$headers = 'From: [email protected]' . "\r\n" .
    'Reply-To: [email protected]' . "\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