Network Administration: Mail Server Location
If you’re having trouble delivering mail to someone, you can use nslookup to determine the IP address of the user’s mail server. Then, you can use the ping command to see whether you can contact the user’s mail server. If not, you can use the tracert command to find out where the communication breaks down.
To find a user’s mail server, start nslookup and enter the command set type=MX. Then, enter the domain portion of the user’s e-mail address. For example, if the user’s address is Doug@LoweWriter.com, enter LoweWriter.com. nslookup will display the MX (Mail eXchanger) information for the domain, like this:
C:>nslookup Default Server: ns7.attbi.com Address: 220.127.116.11 > set type=mx > lowewriter.com Server: ns7.attbi.com Address: 18.104.22.168 lowewriter.com MX preference = 50, mail exchanger = sasi.pair.com lowewriter.com nameserver = ns000.ns0.com lowewriter.com nameserver = ns207.pair.com ns000.ns0.com internet address = 22.214.171.124 ns207.pair.com internet address = 126.96.36.199 >
Here, you can see that the name of the mail server for the LoweWriter.com domain is sasi.pair.com.