weird emails - recipients

Discussion in 'General' started by Ovidiu, Mar 9, 2012.

  1. Ovidiu

    Ovidiu Active Member

    running a Debian 6 server set up according to the perfect server how to and running the latest ISPCFG3.

    I have one domain and email domain on my server where a couple of users have complained about something weird and only these users. no other email domain is affected.

    every now and then, these users will receive an email addressed to their first name @ myservername instead of their real email address and I have no idea why and how this is happening.

    as an example, the latest one was a user with this email: [email protected] receiving an email addressed to [email protected] being my servername assigned to me by strato.

    here are the headers of said email:

    Received: from ([])
    	by localhost ( []) (amavisd-new, port 10024)
    	with ESMTP id trlUW-UJYe39 for <[email protected]>;
    	Fri,  9 Mar 2012 10:08:45 +0100 (CET)
    Received: from ( [])
    	(using TLSv1 with cipher AES256-SHA (256/256 bits))
    	(No client certificate requested)
    	by (Postfix) with ESMTPS id 95169424127
    	for <[email protected]>; Fri,  9 Mar 2012 10:08:41 +0100 (CET)
    Received: from ([] helo=[])
    	by with esmtpa (Exim 4.72)
    	(envelope-from <[email protected]>)
    	id 1S5voK-0000aH-2x
    	for [email protected]; Fri, 09 Mar 2012 11:08:39 +0200
    Received: from localhost (localhost [])
    	by (Postfix) with ESMTP id 796A44241F4
    	for <[email protected]>; Fri,  9 Mar 2012 10:08:52 +0100 (CET)
    Return-Path: <[email protected]>
    From: "Nigel" <[email protected]>
    To: <[email protected]>,
    References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
    In-Reply-To: <[email protected]>
    Subject: Re: Baba Indaba Cape Town Show - Premaman
    Date: Fri, 9 Mar 2012 11:08:28 +0200
    Message-ID: <[email protected]>
    MIME-Version: 1.0
    Content-Type: multipart/mixed;
    X-Mailer: Microsoft Outlook 14.0
    Thread-Index: AQGnDvqZyJHL3u9+ds0m3sE+F2HtKAFVtdScAXE+HkkCkjPbGAE7mRgYAaGBydcCeqG81QGDw2VKAlZ28Tk=
    If i try however to send an email to [email protected] it won't be delivered. =>
    The error that the other server returned was: 550 550 5.1.1 <[email protected]>: Recipient address rejected: User unknown in local recipient table (state 14).

    So far so good but if you have a closer look at the recipient in the above mail example you will see this:

    From: "Nigel" <[email protected]>
    To: <[email protected]>,
    So the sender must have sent to the proper email address and saved this contact as SA but how on earth did this happen? Is there some Outlook incompatibility happening here? How did [email protected] happen? I am sure the user did not check the email headers and construct her first name @ servername address?

    any hints?
    it looks (judging by the headers above) as if the sender is using his providers SMTP servers, that is often the case here in South Africa, most providers even block port 25 but would that cause the recipient to be rewritten?
  2. Ovidiu

    Ovidiu Active Member

    Anyone got any idea how an email could get wrangled like that?
    I know some ISPs in this country force their users to use their own SMTP servers and block port 25 but that even if it were slightly misconfigured it wouldn't cause an email address to get wrangled like this, would it?

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