O'Reilly Answers is a community site for sharing knowledge, asking questions, and providing answers that brings together our customers, authors, editors, conference speakers, and Foo (Friends of O'Reilly). More »
First, make sure that any domain names
used in return addresses resolve to an MX record or an A record. For
example, if the mail server sends out all mail addressed from
user@foo.example, make sure...
Since
mail servers sending mail to a particular domain name mail
destination preferentially use MX records for that domain name, add
an MX record to that domain name pointing to the mail server. We...
If you want to configure a backup
mail server for a mail destination, add an MX
record for the mail destination, listing the domain name of the
backup mail server at a higher preference val...
If you
need to add a mail destination to DNS, add one or more MX records to the zone
that contains the domain name of the mail destination. The MX records
specify the mail server or...