Cannot receive external emails using Exchange 2003

Posted on 2007-08-07
Last Modified: 2013-11-05
I have recently taken over our Exchange server and all was running smooth.

What has recently developed is that users cannot receive emails from external sources. We have no problems with internal or sending external emails but cannot receive external emails.

We run Exchange 2003 and our domain is hosted by our ISP.
Question by:Tim Palmer
    LVL 29

    Accepted Solution


    Do external senders recieve NDR's? Has anything changed at the ISP or your end recently? When you say host the domain do you mean they host your MX records? Do you recieve your mail from the ISP using POP? I'd start by placing your domain name in here and see what errors you get.
    LVL 13

    Expert Comment

    Try the following:
    1) Check your firewall to make sure that port 25 (SMTP) is still being forwarded to your Exchange server.  
    2) Do you have static or dynamic IP addresses from your ISP.  If you have dynamic IPs then your Public IP address may have changed and your DNS "A" record for mail is pointing to the incorrect IP.  If this is the case, try using a solution like  
    LVL 3

    Author Comment

    by:Tim Palmer
    ok, i have contacted my ISP and so far the issue seems to be with them. they have had some reported faults with their services today.
    LVL 3

    Author Comment

    by:Tim Palmer
    turns out the issue was more company politics and without boring you with details, the SMTP relay server which our email spam filterer forwarded to cut us off so it did kind of come down to an MX record solution, but beyond my company.

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