Mail-related name server resource records

The MB, MR, MG, and MX name server resource records are explained here:

MX records

Mail exchanger records. MX resource records indicate that mail directed to a given domain may be routed via this host. They have the format:

   domain  IN      MX      preference      mail.exchanger

MB records

Mail box records. MB resource records indicate that the given user's mail box is on the specified host. They have the format:

   user    IN      MB      host

MMDF translates this to user@host, by appending @host to user.

MR records

Mail rename records. They have the format:

   user    IN      MR      new.mail.address

MMDF replaces user with new.mail.address. It is an alias in the usual sense of the word.

MG records

Mail group records. They have the format:

   list    IN      MG      user1@host1
   list    IN      MG      user2@host2

MMDF uses MG records to build a list of mail addresses to send the mail to.

See also:

• the named(ADMN) manual page