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BCC recipients showing up in Envelope-to:

Discussion in 'E-mail Discussion' started by Michael-Inet, Jul 29, 2017.

  1. Michael-Inet

    Michael-Inet Well-Known Member

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    Before I submit a bug, checking with the community ...

    From both Drupal and KMail an email from/through one of my WHN/cPanel servers with:

    From: xyz@[domain]
    To: xyz@[domain]
    BCC: test-user1@[mydomain]
    BCC: test-user2@[mydomain]


    Are showing all BCCs in the email Envelope-to: headers upon receipt, e.g.:

    Return-path: xyz@[domain]
    Envelope-to: test-user1@[mydomain],
    test-user2@[mydomain]
    Delivery-date: Fri, 28 Jul 2017 12:05:58 -0400
    Received: from [cPanel account] by [cPanel server] with local (Exim 4.89)
    (envelope-from <xyz@[domain]>)
    id [removed]; Fri, 28 Jul 2017 12:05:58 -0400


    Is this a bug?
     
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  2. cPanelMichael

    cPanelMichael Technical Support Community Manager
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    Hello Michael,

    It's possible the BCC address was transmitted by the email client (or the script using sendmail). Here's a link that explains this further:

    Q5004 · Exim/exim Wiki · GitHub

    Could you verify if you can reproduce this behavior from a different email client (e.g. Outlook, Thunderbird)? Also, what version of cPanel is installed on the system?

    Thank you.
     
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  3. Michael-Inet

    Michael-Inet Well-Known Member

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    Hi Michael,

    > From both Drupal and KMail

    It's doing it with both KMail and through a Drupal 7 site hosted on the server. Further testing seems to confirm that sending to 2 emails to an off box domain, does not have the issue. Definite “maybe” though, the mails went through MS and a chain of outlook.com servers and my skills understanding “Received: from” headers are not the best, but there weren’t both of the recipients in one mail, so...

    So, it tentatively seems explicitly an issue with sending to multiple BCCs to a single domain hosted upon WHM/cPanel.

    The cPanel install is set for auto-update. Exim was just updated (21-Jun-2017). The only real box abnormality is PHP is stuck at an older version for comparability reasons.

    Probably more than you want ;) but pasting version info below.

    Best,
    Michael

    >>Edit:
    I actually don’t know how to get the cPanel version number, copy/pasting stuff...

    CENTOS 6.9 x86_64 virtuozzo – srv04 cPanel & WHM 64.0 (build 36)

    Change Log for 64.0.36
    Entry: 2017-07-25, 17:30 (UTC)
    Edit:<<

    Exim version 4.89 #1 built 21-Jun-2017 15:43:43
    Copyright (c) University of Cambridge, 1995 - 2017
    (c) The Exim Maintainers and contributors in ACKNOWLEDGMENTS file, 2007 - 2017
    Berkeley DB: Berkeley DB 4.7.25: (September 12, 2013)
    Support for: crypteq iconv() IPv6 PAM Perl OpenSSL Content_Scanning DKIM DNSSEC Event OCSP PRDR Experimental_SPF Experimental_SRS
    Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch dbm dbmjz dbmnz dnsdb passwd sqlite
    Authenticators: cram_md5 dovecot plaintext spa
    Routers: accept dnslookup ipliteral manualroute queryprogram redirect
    Transports: appendfile/maildir autoreply lmtp pipe smtp

    CentOS release 6.9 (Final)
    Linux [removed] 2.6.32-042stab120.18 #1 SMP Fri Jan 13 10:32:04 MSK 2017 x86_64 x86_64 x86_64 GNU/Linux

    Server version: Apache/2.2.27 (Unix)
    Server built: Aug 27 2014 20:57:01
    Cpanel::Easy::Apache v3.26.6 rev9999

    PHP 5.3.29 (cli) (built: Aug 27 2014 21:04:20)
    Copyright (c) 1997-2014 The PHP Group
    Zend Engine v2.3.0, Copyright (c) 1998-2014 Zend Technologies
    with eAccelerator v0.9.6.1-ea, Copyright (c) 2004-2012 eAccelerator, by eAccelerator
    with the ionCube PHP Loader v4.6.1, Copyright (c) 2002-2014, by ionCube Ltd., and
    with Zend Guard Loader v3.3, Copyright (c) 1998-2010, by Zend Technologies

    # kmail -v
    Qt: 3.5.0
    TDE: R14.0.4
    KMail: 1.9.10 (enterprise35 0.20100827.1168748)

    Drupal core version: 7.56
    Mass Contact (mass_contact) 7.x-1.1
    Mime Mail (mimemail) 7.x-1.0
    Token (token) 7.x-1.7
     
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    #3 Michael-Inet, Aug 1, 2017
    Last edited: Aug 1, 2017
  4. cPanelMichael

    cPanelMichael Technical Support Community Manager
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    Twitter:
    Exim will not remove the "BCC" entry from the message header for incoming SMTP or command-line mail if it's included by the email client. Thus, it's likely the behavior you notice is by-design. This is explained in more-detail on the following URL:

    Q5004 · Exim/exim Wiki · GitHub

    Feel free to open a support ticket using the link in my signature if you'd like us to verify that's what's happening on the affected system.

    Thank you.
     
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  5. Michael-Inet

    Michael-Inet Well-Known Member

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    Thanks for the info Michael,

    If that's how Exim works, then that's how it works...

    *shrug* It only seems to happen if it's on box, so probably not worth any more time figuring out.
     
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