Changes

====='''With''' a backup MX:=====

====='''With''' a backup MX:=====

* The sending mail server cannot contact your server

* The sending mail server cannot contact your server.

* The sending mail server sends the mail to your secondary MX

* The sending mail server sends the mail to your secondary MX.

* The secondary MX queues the mail until your link/server is up

* The secondary MX queues the mail until your link/server is up.

* The mail is queued on an '''untrusted''' third-party mail server (''think about confidential mail between your company and some business partner'')

* The mail is queued on an '''untrusted''' third-party mail server (''think about confidential mail between your company and some business partner'').

* The sending mail server's administrator ''thinks'' it has been delivered, according to their logs

* The sending mail server's administrator ''thinks'' it has been delivered, according to their logs.

* You have no, or little, visibility over the queued mail

* You have no, or little, visibility over the queued mail.

* When your link comes up, the secondary MX sends the mail on to your server

* When your link comes up, the secondary MX sends the mail on to your server.

* You have added more hops, more systems and more delay to the process

* You have added more hops, more systems and more delay to the process.

If you think that a backup MX will protect against broken mail servers  

If you think that a backup MX will protect against broken mail servers