exchange server not reciving mail

Posted on 2011-04-26
Last Modified: 2012-08-13
Have a customer with a 2007 exchange server (sbs 2008)
Last week their server just stopped reciving mail.-
Checked telnet against public ip on port 25 - OK
Their mx record points to a 3rd party spamfilter. Have asked them and they say all is good on their side..  Can send mail out, and internally.

Any suggestions?
Question by:TelehusetMoss

    Expert Comment

    Did you check the dns if it is pointing to the right ip address?
    LVL 6

    Expert Comment

    by:Vipin Vasudevan
    Hey use below link to check mx records and spf records for customer public IP and domain
    LVL 2

    Accepted Solution

    I would use (it is a MS tool) - post where it fails.

    Can you telnet to the 3rd party spam solution?

    Author Comment

    emm.. As staded the mx-record points to a spam-filter. So i'ts not pointing to their IP.
    The spam provider resends to their ip.

    Author Comment

    Yes.I can telnet 3rd party spamfilter

    Author Comment

    LVL 34

    Assisted Solution

    by:Shreedhar Ette
    Send test mail using the SMTP commands. Externally.

    You telnet to the exchange server public ip on port 25 and then refer the below article:

    I suspect that the issue is at the spam filter.

    LVL 2

    Expert Comment

    It looks like the recipient mailbox is not valid (doesn't exist?)

    Ensure all of the Exchange Services are running. Have you restarted the server?
    LVL 5

    Expert Comment

    Is your third party spam service forwarding to the correct server? Do they have any logging which shows were this fails?

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