I find DNS very usefull, if you have many users on your system it is easier to connect to, lets say " Bob" than it is 192.168.20.36 or whatever you use for Ip's. Their are other reasons but this is what I use it for.
Chris
another reason is when u have a large n/w then if more than 2 different lan n/w (with different subnets ) exist then dns also helps in resolving which n/w a request belongs to. instead of sending a packet on all n/w for identification.. ofcourse as matrix7 says giving easy to identify with names r easier to remember m/cs rather than using the dot notations ip addresses.
When an E-mail is sent using smtp from the client, it reaches the server and if sendmail is setup as the mail exchange it will reject the message as it can not identify what the senders address is as it is not in the DNS.
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