On Sat, 11 Aug 2001, Manish Jethani spewed into the ether: <snip>
What does postmaster mean?
Normally, for each service you run, you have a dedicated controller of that service. For mail, the person in charge of the service is called postmaster. There is an RFC of which aliases to maintain for which service. For mail: postmaster For www: webmaster For DNS: hostmaster For mailing lists: list-owner <snip>
Is this absolutely necessary? What's the use?
Some mail servers are configured to reject mail from hosts without a valid reverse DNS lookup. This normally goes to the name server in charge of your ip block, but it doesn't hurt to add this line. Also, it helps your mail server in logging information.
Devdas Bhagat