Thank you all for your most helpful tips. I will spend some time with this information and see what I come
On Wed, May 4, 2011 at 1:01 PM, Jeroen Geilman <jer...@adaptr.nl> wrote: > On 05/04/2011 09:36 PM, Christopher Adams wrote: >> >> Hello, >> >> I am attempting to get Postfix working as a relay to an Exchange 2010 >> server in the same subnet. The incoming mail may originate from the >> same subnet, but it all goes through a central server that is outside >> the subnet. I am doing this for troubleshooting connections between >> the central server and the Exchange server, so it is only temporary. >> >> The outside server would route mail through the server running >> Postfix, which would then relay to the Exchange server. >> >> To get the results that I want, without planning for a permanent setup >> to relay to Exchange, what Postfix configuration parameters do I need >> to set? >> >> These are the parameters that I am guessing have to be tinkered with >> and I have added some values, but am unsure about if I need to do >> anything with the others. Since I don't want mail to be delivered >> locally on the Postfix server, I am assuming that mydestination should >> be empty? >> > > When doing this sort of man-in-the-middle magic you need to consider all > worst-case scenarios. > These definitely include exchange being down and your postfix box queueing > the external mail. > Have you considered what should happen in that case ? > >> relay_domains = $mydestination, ip.of.outside.mailserver > > ...no, relay_domains contains the domains you wish to relay mail FOR. > In this case, the domains configured on the Exchange server and coming in > via the external MTA. > >> mydestination = (empty) > > You want mydestination set to the resolvable name of this postfix server, > or, at a minimum, to "localhost". > > If you set it explicitly to empty then no mail can ever be delivered locally > - including system mail to root or postmaster. > >> myorigin > > Is not directly involved in your setup, and defaults to $myhostname (which > should be fine). > >> relayhost = [exchange.server.ip] > > Note that this will send ALL mail to Exchange, not just the mail you receive > from the external MTA. > >> Thanks for getting me started in the right direction. > > Please start here, and work your way up: > > http://www.postfix.org/BASIC_CONFIGURATION_README.html > > > > -- > J. > >
