Hello all

I have a postfix relay running in RHEL 5.
It serves as an SMTP server.
Mail traffic is delivers to the exchange server/Active directory system that is handled by another admin.

So far postfix serves example.com
I am asked if it's possible to configure the same server to relay inbound and outbound email for the domain otherexample.com

Any suggestions?

In your /etc/postfix/main.cf file, you should find a line that starts with "relay_domains=".
This most likely has your 1st domain listed there. Add the 2nd domain to this line separated by a comma. The final result should look something like:
relay_domains=example.com,otherexample.com

Dave

i was wrong

If this is a relay server and it is supposed to relay mail to an Exchange server, then it should not be the destination for those domains. It should be configured to relay for those domains.

You may also need to configure transport maps for the domain, since an MX lookup might yield the wrong results. Check to see if your main.cf file has a line like this one:
transport_maps=hash:/etc/postfix/transport

you may have to edit the file that it points to (it may not be /etc/postfix/transport). This file will override the DNS query and directly route mail for a specific domain to a predetermined destination. You may have something like this:

example.com smtp:exchangeserver.example.com

you'll have to make another entry for your new domain, and point it to the appropriate destination server. After you modify this file, run:
postmap /etc/postfix/transport (or whatever the file is that you had to edit)

There are a myriad of other ways to accomplish the same basic function, so your results may vary.

Yes im sorry your right since it's relayed it will accept mail for any domain anyways

i was confused with postfix denieing mail for domains not in mydestination but that is only when that server handles it

the admin of the server thats relayed too has todo this then


Sorry my bad