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POP3 Connector not forwarding unresolved recipients to global mailbox.

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  • POP3 Connector not forwarding unresolved recipients to global mailbox.

    Hi guys,

    Recently my company setup a new SBS2003 server for one of our clients. They have a requirement to use unique email addresses for each client for security purposes, so we had set them up with the POP3 connector. At the ISP end the mailbox is global (effectively sending to *@domain.co.uk will work) and the messages are being forwarded to the Exchange server. However the non-existant emails at the exchange end are being rejected with an SMTP 5.1.1 NDR.

    What we can't figure out is why the forward unresolved recipients to exchange mailbox on the Troubleshooting tab of the POP3 Connector properties seemingly has no effect. We've enabled message tracking and it's definitely the exchange server and not the ISP generating the NDR.

    I'm aware that SMTP is a better solution and that catch-all mailboxes are not a very good idea, but this customers requirements are quite specific on this need - something to do with security and privacy agreements they are bound by.

    Any advice greatly appreciated!
    Last edited by cruachan; 26th September 2008, 20:38.
    BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
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    Cruachan's Blog

  • #2
    Re: POP3 Connector not forwarding unresolved recipients to global mailbox.

    I've been talking to Microsoft about this as well, and it seems that the only way to do this is to add a Routing Rule to the POP3 connector to tell it to route unrecognized email to the global mailbox. However, seeing as you can much more simply add a new SMTP address to an existing account it rather begs the question what is the point of this option?

    Anyway, looks like we're creating each email address individually for this customer, which at least prevents spam issues from having all mail delivered.
    BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
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    Cruachan's Blog

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    • #3
      Re: POP3 Connector not forwarding unresolved recipients to global mailbox.

      Okey dokey, in the unlikely event anyone has a similar issue Microsoft have confirmed that this is the correct behaviour for an SBS POP Connector. In other words, the Unresolved Recipients options needs to be used in conjunction with routing rules so is pointless as it's much easier to create a new SMTP address.

      What we did was setup a new Enquires distribution group and add the extra SMTP addresses to it (Around 70 in total). A bit of a kludge but no other option we could find.
      BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
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      Cruachan's Blog

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      • #4
        Re: POP3 Connector not forwarding unresolved recipients to global mailbox.

        If you don't mind spending an extra 100, you could try POPCON it will also get your emails downloading upto every min

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        • #5
          Re: POP3 Connector not forwarding unresolved recipients to global mailbox.

          Why not get Exchange to receive mail directly and not use POP3 at all?
          cheers
          Andy

          Please read this before you post:


          Quis custodiet ipsos custodes?

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          • #6
            Re: POP3 Connector not forwarding unresolved recipients to global mailbox.

            Popcon won't necessarily resolve this issue, which we have worked around anyway, so no point in spending cash unneccessarily.

            We could move the customer to SMTP mail now, but getting this issue resolved has completed our project with them. Should they decide to take a support contract with us one of the first things we'll likely do is move them to SMTP mail.
            BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
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            Cruachan's Blog

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            • #7
              Re: POP3 Connector not forwarding unresolved recipients to global mailbox.

              Ok fair enough.
              Thanks for posting the info.
              cheers
              Andy

              Please read this before you post:


              Quis custodiet ipsos custodes?

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