Cannot reply to emails sent via Gmail

I agree with dagmar, it is a problem when contact form is used with Google's SMTP server.

My hosting provider is forcing me to use SMTP for all outgoing emails, and Google rewrites the "From" header, so I cannot reply to emails sent to me via contact form.

I'll tried your patch, dagmar, and it does achieve the desired result - ability to click "Reply" and actually send email to original sender.

I have to disagree here: the PHPMailer module is a dumb library, it takes whatever it is fed and doesn't make any custom alterations specific to a certain configuration.

Luckily, Drupal provides a way to do the required alterations: what you want is a custom hook_mail_alter() implementation, something along the lines of

function custom_mail_alter(&$message) {
  // See contact_mail_page_submit() for all possible ids.
  if ($message['id'] == 'contact_page_mail') {
    $message['headers']['Reply-To'] = $message['from'];
  }
}

(Untested.) Put that code into custom.module, add an .info file and you have the desired Reply-To header in the e-mail.

However, the module didn't actually make use of the Reply-To headers until now, thus you need a decent development snapshot for this technique to work.

Ok, thought about this again and it seems safe to set Reply-To to the From address if, and only if, the message doesn't contain an explicitly set Reply-To header, otherwise we would possibly add a wrong reply-to address. Since drupal_mail() doesn't set this header, PHPMailer may use the From address unless it has been set by another module. Please test the attached patch.

E-mails sent with a Reply-To look ugly in e-mail programs. This should really be turned into an advanced option with an explanation when to enable.

I installed the latest dev to try to deal with gmail changing the from address and after running update.php and testing the form, I get this error:

Can not call constructor in /[path]/phpmailer/includes/phpmailer.class.inc on line 26

@kthull
Which version of the PHPMailer library did you download? It is possible that the latest changes regarding exception handling require one of the 5.0.x versions (5.1 hasn't been tested yet, but should work, too).

I used 5.0.2. I can no longer recall how many different things I tried, but I know I had to abandon gmail altogether. I'm using PHPMailer with a non-gmail smtp server and working just fine now.

Thanks!

Ok, I've added an option to the settings page and updated the Google Mail instructions accordingly. Committed the attached patch to all branches.