How to Verify that MX Records Do Not Point to the FQDN of an Exchange Server


Topic Last Modified: 2005-05-20

When SMTP queries DNS, it always queries for MX records first. If an internal MX record exists and/or it is incorrectly configured, your internal mail delivery may not work.

Before you perform the procedure in this topic, read Verifying DNS Design and Configuration

  1. At a command prompt, type nslookup, and then press ENTER.

  2. Type server <IP address>, where IP address is the IP address of your internal DNS server.

  3. Type set q=mx, and then press ENTER.

  4. Type <fqdn>, where fqdn is the fully qualified name of your SMTP virtual server (and your Exchange server), and then press ENTER.

  5. Verify that no MX records exist for your internal server. Your results should look similar to the following:

    > set q=mx
    > server1.example.local
            primary name server = server01.example.local
            responsible mail addr = hostmaster.example.local
            serial  = 6225703
            refresh = 900 (15 mins)
            retry   = 600 (10 mins)
            expire  = 86400 (1 day)
            default TTL = 3600 (1 hour)

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