VERP info not added to mail headers?

Question

I'm trying to set up the CiviMail return channel, and expect that, if I do it properly, headers like Reply-To and/or Return-Path will have values like bounces+verp-stuff@mydomain.com, but so far, that's not happening.

What I've done so far:

1. Created an email account [email protected] through Google Apps, and verified it receives an email sent to [email protected]
2. Edited the default mail account at /civicrm/admin/mailSettings?reset=1, with values (server, username, password, protocol, use ssl) that allow it to check email over IMAP on the [email protected] and verified that some messages in that account get labeled with the inbox-civimail-ignored.
3. Also at /civicrm/admin/mailSettings?reset=1, set "Email Domain" = "mydomain.com" and "Used For?" = "Bounce processing". Other fields in this form are blank.
4. Outbound Email (/civicrm/admin/setting/smtp?reset=1) is set to "mail()"

I then create a new scheduled mailing and send it out using the "Send Scheduled Mailings" job, and the mail arrives with these headers:

Delivered-To: [email protected]
Received: by a.a.a.a with SMTP id x3csp113516itf;
        Wed, 29 Jul 2015 10:06:44 -0700 (PDT)
X-Received: by b.b.b.b with SMTP id o40mr63319942qga.0.1438189604113;
        Wed, 29 Jul 2015 10:06:44 -0700 (PDT)
Return-Path: <[email protected]>
Received: from mydomain.com (mydomain.com. [c.c.c.c])
        by mx.google.com with ESMTP id g9si32260106qgf.41.2015.07.29.10.06.43
        for <[email protected]>;
        Wed, 29 Jul 2015 10:06:44 -0700 (PDT)
Received-SPF: pass (google.com: domain of [email protected] designates c.c.c.c as permitted sender) client-ip=c.c.c.c;
Authentication-Results: mx.google.com;
       spf=pass (google.com: domain of [email protected] designates c.c.c.c as permitted sender) [email protected]
Received: by mydomain.com (Postfix, from userid 33)
    id D96011442D; Wed, 29 Jul 2015 17:06:43 +0000 (UTC)
To: Two Mice <[email protected]>
Subject: test 6fd
X-PHP-Originating-Script: 1001:mail.php
MIME-Version: 1.0
Content-Type: multipart/alternative;
 boundary="=_10b250b1b5a6af786cd9e0315548c9d9"
Reply-To: "My Site"
 <[email protected]>
From: "My Site" <[email protected]>
List-Unsubscribe: <mailto:[email protected]>
job_id: 94
Precedence: bulk
X-CiviMail-Bounce: [email protected]
Date: Wed, 29 Jul 2015 12:06:43 -0500
Message-Id: <[email protected]>

--=_10b250b1b5a6af786cd9e0315548c9d9
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset=utf-8

Suspecting that our postfix setup might be messing with the headers, I set Outbound Email (/civicrm/admin/setting/smtp?reset=1) to "Redirect to Database", then created a new scheduled mailing and sent it out. The mail was stored in the civicrm_mailing_spool table with these headers:

MIME-Version: 1.0
Content-Type: multipart/alternative;
 boundary="=_6f3fb5f7026a6aecc8d6a73af912a390"
Reply-To: "My Site"
 <[email protected]>
Return-Path: [email protected]
From: "My Site" <[email protected]>
Subject: test 7
List-Unsubscribe: <mailto:[email protected]>
job_id: 100
To: Two Mice <[email protected]>
Precedence: bulk
X-CiviMail-Bounce: [email protected] | --=_6f3fb5f7026a6aecc8d6a73af912a390
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset=utf-8

Question: What else should I do to get bounces to be directed to my [email protected] address?

Answer 1

In the Mail Accounts entry you set up, you need to set bounces+ as the localpart. Everything else looks good.

In your examples, you have [email protected] as the return-path in the the first one and [email protected] in the second. CiviMail just needs to know to tack "bounces+" on the front of those addresses, and that's where the localpart comes in.