$ host -t mx lums.edu.pk
lums.edu.pk         	MX	50 abaseen.lums.edu.pk

$ host abaseen.lums.edu.pk     
abaseen.lums.edu.pk     A       172.28.1.2
abaseen.lums.edu.pk     A       203.128.0.2

$ telnet  203.128.0.2 smtp
Trying 203.128.0.2...
Connected to 203.128.0.2.
Escape character is '^]'.
Connection closed by foreign host.