+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
/ MGMNAME /
/ /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
where:
MGMNAME A <domain-name> which specifies a mailbox which is a
member of the mail group specified by the domain name.
MG records cause no additional section processing.