Single email being sent multiple times to recipeint, Exchange 2003 Sp2

Posted on 2007-08-07
Last Modified: 2013-11-30

Our environment

Exchange 2003 sp2 running on windows 2000 AD server.

This happens once in a a blue moon, but will happen to between 3 and 10 emails.

All other emails will be fine, but the recipient of the affected emails will receive between 100 and 300+ emails all the same.

We also have Watchguard Firebox x550e with smtp proxy outbound. (Fireware 8.3)

Any ideas on this would be appreciated
Question by:Raybans
    LVL 4

    Expert Comment

    1. Are these email accounts generic accounts? Their roles?
    2. Does this happen to the same email accounts everytime?
    3. How often is once in a blue moon? Is there a set pattern?
    4. Is your SMTP server forwarding and receiving mails from another external SMTP server (like your ISP or email provider)?
    5. Are these emails a duplicate of the same email or different emails?

    It's not likely your Watchguard with the SMTP outbound thing. this is an inbound problem.

    LVL 2

    Author Comment

    there is no set pattern

    the email accounts that it is being sent from is normal, nothing unusual or special

    it happened with 3 emails about a month ago.

    and then with 2 emails from one person, and 1 from another over the weekend.

    They appear to all be duplicates of the same email, but with a new ID when you look at the headers.

    We are sending from the exchange server directly via dns
    The problem is with us SENDING emails not receiving.

    the person in question sent an email from our server to X, and X received it 300 times.

    Since this has happened to a couple of other receipients that are not related I am looking at it from our end.
    LVL 4

    Expert Comment

    Hmmm... i would say it's the Watchguard then. Will do some research get back to you.

    I believe if you still have a maintenance agreement with them you might want to check their knowledge base.

    Have you tried powering down the firewall for 2 mins then powering up again?
    LVL 3

    Expert Comment

    I had this problem once before.  It turned out to be a bandwidth problem.  Basically, the sending server would get a reply that the email didn't go through but it really had, so it would send another copy.  After upgrading our dsl to a faster line, all our problems were resolved.
    LVL 32

    Accepted Solution

    One of the options is configure WG not to do anything with the SMTP outbound traffic, in such a case configure Outbound SMTP traffic using a filtered-SMTP Service instead of SMTP-proxy.

    Now observe if you observe the problem. If yes, then it is not WG. Otherwise, you should decide how much and what level of filtering would you like on the outbound traffic.

    Thank you.

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