I've been testing Postifx for some solutions.......
One attempt
was to make 2 entries with the same host name in /etc/hosts
e.g
10.222.100.1 exchange.mydomain.local exchange
10.333.200.2
exchange.mydomain.local exchange
Then changed the transport map
to
mydomain.local smtp:[exchange.mydomain.local]
My
info is that the square brackets stop Postifix doing mx record lookups.
This didn't work and I don't know why. It works fine with an
IP address inthe square brackets and the Linux box can resolve
exchange.mydoamin.local to an IP.
Any suggestions?
>
>
> Thanks for the advice.
>
> I don't use relay maps for the domain as
> the
Internet doamin is shared betweent he MS Exchange server and the
>
Postfix server. i.e I use MySql address lookups onthe Postfix server so
> it's easy to create addresses to forward email to different or
multiple
> accounts. e.g sa...@xxx.com
>
> I
don't think that multiple DNS
> records will work. (Although I may
be wrong.)
>
> I use this
> technique, DNS round
robin to evenly spread rdp connections to our
> terminal servers.
My understanding is that a device does a DNS lookup and
> the
server hands out each different IP address sequentially. Each device
> uses (caches) the first IP address it recieves until it's
rebooted.
>
> i.e When the primary MS Exchange server
went offline, Postifx
> wouldn't necessarally do another DNS looup
and find the second record.
>
> Is it possible to setup
multiple transport records wth different
> costs to a domain? This
may be a solution.
>
> Cheers,
>
>
Greg.
>
>
>
>> Greg Wilson:
>>> 2 different
> servers. How do I setup Postfix to
>>> automatically forward
>>> messages to one of
the MS Exchange servers if
>>> the
> other one
goes
>>> offline?
>>
>> Two
>
options:
>>
>> A) Assuming that you use the
> "relay" transport in master.cf
>> (which you
should if
> relaying mail from outside):
>>
>>
> /etc/postfix/master.cf:
>> relay
unix - - n
> - - smtp
>>
-o smtp_fallback_relay=[1.2.3.4]
>>
>> B) In the
transport map, specify a hostname that
> resolves to TWO
>> IP addresses. Make up your own DNS or /etc/hosts
>
entry if you
>> need to.
>>
>> Wietse
>>
>
