Messages with an unreachable destination. Queue

Posted on 2004-10-26
Last Modified: 2013-11-15
I’m looking at the SMTP default virtual server Queues, specifically the “Messages with an unreachable destination” Queue and I have over 150 messages in the queue, over 95% of them are inbound messages. Why is this happening and how do I prevent it from sticking in the queue?

Thank you for your time
Question by:mspencer100
    LVL 2

    Expert Comment

    Are those valid e-mails for real mailboxes, or they look like spam?

    What error are you getting when you trying to force it go ?

    Author Comment

    All the inbound stuff looks like spam... so i did not force it yet.
    LVL 2

    Assisted Solution

    if it look like a spam, there is nothing much you can do:

    some messages (spam especially) are generated by scripts and sometimes are not formed correctly, so they may stuck in inbound queue.  If they all come from same place - block the recipients domain , or obtain some sort of spam filters.

    try to force one message through and see if there any error message.
    LVL 104

    Accepted Solution

    Take a look at something like GFI Mail Essentials. This will sit in front of the Exchange server between it and the Internet. It can do a lookup on your AD database and block any emails with addresses that don't exist on your domain.

    Exchange 2003 has the feature built in.


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