[TriLUG] secondary MX

[Tanner Lovelace]

On 6/28/05, Alan Porter <porter at trilug.org> wrote:
> What does a secondary MX do?  Would this give my personal
> email system (which uses a dyndns.org address) a higher
> level of availability?

Yes.
 
> Is it fairly easy to implement?  What's involved on the
> TriLUG mail server end?  What about on the member's end?
> Does he just create a second MX record for his domain?

On the trilug mail server end, you add the domain as a new
line in /etc/postfix/relay-domains.  That's it.

On your end, you need to create a second MX record with a
lower priority (that is, a _higher_ number) pointing to mail.trilug.org
and reload your dns zone.

That's it.  From then on it just works.  If a server can't contact
your server to pass mail (which it will do first because of the
higher priority [lower number] on the MX record) it goes to
the next server in the list which would be mail.trilug.org.
The trilug mail server will then notice that another MX has 
precedence over it and try to deliver it to your server.  It
will keep trying based on the postfix retry configuration 
(which is just the standard for us right now).

Cheers,
Tanner

-- 
Tanner Lovelace
clubjuggler at gmail dot com
http://wtl.wayfarer.org/
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