Calendar Invite from external party RRS feed

  • Question

  • Interweb,

    We are having an odd issue that started a couple of weeks ago, I believe.  When an external sender sends a calendar invite to any one in our organization, the sender will receive a bounce back from a distribution group.  The message is delivered to the intended recipients.  Below is the bounce back that people are receiving.  I have checked the settings on that distribution mailbox and nothing seems out of the ordinary.  We have a policy on Exchange to prevent messages from being sent to distribution groups so Exchange is doing what we have told it to do.  Its just really weird that calendar invites are including that group when it wasn't ever added to begin with.

    Any assistance that can be provided would be greatly appreciated it.  

    Delivery has failed to these recipients or distribution lists:

    ITS Communications<>
    Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.
    Sent by Microsoft Exchange Server 2007

    Diagnostic information for administrators:

    Generating server: domain.local
    #550 5.7.1 RESOLVER.RST.NotAuthorized; not authorized ##

    Original message headers:

    Received: from RALMSX02.domain.local ([fe80::899b:8e87:c544:ef87]) by
     RALMSX02.domain.local ([fe80::899b:8e87:c544:ef87%14]) with mapi; Mon, 21 Oct
     2013 10:48:59 -0400
    Content-Type: application/ms-tnef; name="winmail.dat"
    Content-Transfer-Encoding: binary
    From: "Erik J. Small" <>
    To: ITS Communications <>
    Date: Mon, 21 Oct 2013 10:48:58 -0400
    Subject: [*****SPAM*****]  Invitation: Test Event @ Mon Oct 21, 2013 11:30am
     - 12:30pm (
    Thread-Topic: [*****SPAM*****]  Invitation: Test Event @ Mon Oct 21, 2013
     11:30am - 12:30pm (
    Thread-Index: Ac7ObKyTe88w2saTR0KxhZVKpxG8rw==
    Message-ID: <C7CD6327C3575240B43862411B9336150B2A16AA9E@RALMSX02.domain.local>
    Reply-To: "Erik J. Small" <>
    Accept-Language: en-US
    Content-Language: en-US
    X-MS-Has-Attach: yes
    X-MS-TNEF-Correlator: <C7CD6327C3575240B43862411B9336150B2A16AA9E@RALMSX02.domain.local>
    x-asg-debug-id: 1382366936-02eba17ceb1011fd0001-lHt8NN
    x-asg-orig-subj: Invitation: Test Event @ Mon Oct 21, 2013 11:30am - 12:30pm
    x-barracuda-start-time: 1382366937
    x-virus-scanned: by bsmtpd at
    x-barracuda-bayes: SPAM GLOBAL 1.0000 1.0000 4.3430
    x-barracuda-spam-score: 4.85
    x-barracuda-spam-status: Yes, SCORE=4.85 using global scores of
    x-barracuda-spam-report: Code version 3.2, rules version   Rule
     breakdown below         pts rule name              description ----
     ---------------------- --------------------------------------------------
            0.00 BSF_SC0_MISMATCH_TO    Envelope rcpt doesn't match header  0.00
     MAILTO_TO_SPAM_ADDR    URI: Includes a link to a likely spammer email  0.00
     HTML_MESSAGE           BODY: HTML included in message  0.50 BSF_RULE7568M
              Custom Rule 7568M
    x-barracuda-spam-flag: YES
    dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed;;
    auto-submitted: auto-generated
    x-received: by with SMTP id g13mr5310539igz.1.1382366936520;
     Mon, 21 Oct 2013 07:48:56 -0700 (PDT)
    x-barracuda-encrypted: RC4-SHA
    MIME-Version: 1.0

    Content-Type: message/delivery-status

    Reporting-MTA: dns;domain.local
    Received-From-MTA: dns;
    Arrival-Date: Mon, 21 Oct 2013 14:48:59 +0000

    Final-Recipient: rfc822;
    Action: failed
    Status: 5.7.1
    Diagnostic-Code: smtp;550 5.7.1 RESOLVER.RST.NotAuthorized; not authorized
    X-Display-Name: ITS Communications

    Monday, October 21, 2013 3:27 PM


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