[cobalt-users] Configuring secondary MX on RAQ.

["david.priest@xxxxxxxxxxxxxxx" <david.priest@xxxxxxxxxxxxxxx>]

I have configured 2 RAQ's - for instance:

  raq1.domain.com - Primary DNS and MX for domain.com
  raq2.domain.com - Secondary DNS and MX for domain.com

The DNS side works fine - the secondary DNS updates its records and will service requests for domain.com - no problem!

However, the problem is with configuring a secondary MX on raq2.domain.com

In the DNS records (on raq1) I have created:

  MX - High Priority - raq1.domain.com
  MX - Low Priority - raq2.domain.com

Now if mail arrives at raq1.domain.com it is processed correctly - no problem there!

If mail arrived at raq2.domain.com it reported "relaying denied" - but I was able to get around this by adding domain.com into the list of domains allowed to relay for - again no problem!

Now if mail arrived at raq2.dmpriest.com (the backup MX) it was then instantly forwarded to raq1.domain.com - correct!

But - if raq1.domain.com (the primary MX) was "down" - mail would be delivered to raq2.dmpriest.com (secondary MX - also correct!) but it would try and *instantly* redeliver to the primary MX. As the primary MX was down it would then fail and return the following:

  ----- Transcript of session follows -----
  553 5.3.5 raq2.domain.com. config error: mail loops back to me (MX problem?)
  554 5.3.5 <test@xxxxxxxxxx>... Local configuration error

Now I checked on the Internet and found references to this in the sendmail documentation - see: http://www.sendmail.org/faq/section4.html#4.5

It would seem that you may be required to manually update some of the sendmail config files?

My question is - is there a way to configure a RAQ (it's a RAQ4 incidentally) as a backup MX from the user interface so that it will act as a true backup MX and *queue* the mail until the primary MX is back available again.

Thanks... David.