Code: 1. 2. 3. 4. INTERNET <==>| IIS-SMTP |<==>| PF/RELAY/SPAMCNTRL |<==>|EXCHANGE | PF/IMAP/SQ ADmember Postfix MX? MX? iis.domain.com postfix.domain.com mail.domain.com Hi, Above is my mail config. It's not exactly the ideal situation(...). 1, 2 & 4 are working, and dealing with loads of mail, so there's no problem. Part 3 has to take part to fight spam, and control and visualise amounts (mailgraph). There are a few things I can not find any answers for, so hopefully someone can help me out. - The easiest way would be to just relay all mail with destination domain.dom in the order 1->2->3->4; - The reply order should be 4->3->2->1; 1. How do I have to configure the relay part? After reading many pages I concluded that user (ie. SMTP address) authentication is nessessary for Postfix, otherwise it will just not work. Is this a fact? There is an easy way to configure authentication with a perl script to check all Active Directory SMTP addresses: http://www-personal.umich.edu/~malth/gaptuning/postfix/ 2. With the method discribed above I managed to replicate this in a test environment from 1 - 4 without a problem. Internet in the test environment is in this case another Postfix/CourierIMAP/Squirrelmail server with a few fake domains. 3. The problem starts when I reply as an Exchange user. The message stops at point 3 with the message: status=bounced (Host or domain name not found. Name service error for name=internet.test type=AAAA: Host not found.) The message is quite logic, because the host does not exist. So here we get to the point. 4. How can I let all mail from 4, relay via 3 to 2? Or, maybe even better, how can I create a transparent relay server?. The extra options I configured for the Postfix server of number 3. Code: mydomain = test.lan myorigin = $mydomain #relay_transport = smtp:[testiis.test.lan] relay_domains = test.lan relay_recipient_maps = hash:/etc/postfix/ad_users hash:/etc/postfix/ad_users2 hash:/etc/postfix/pf_users show_user_unknown_table_name = no I know it's quite a story, but I couldn't find another way to tell it. Thanx.
Take a look here: http://www.howtoforge.com/postfix_relaying_through_another_mailserver You could add internet.test to /etc/hosts, if there's no DNS record for it.
Falko, thanks for the reply. Of course I could add that particular domain, but that's unfortunatly not possible with all the other domains I will have to reply to in the future I'm afraid that your howto will not work in my case, because of its different setup, also combined with Exchange. The thing I'm realy looking for is a 'transparent' way, to transport e-mail from server 4 to server 2. When I use the option Code: relayhost = iis.domain.com all e-mail will be relayed true that server, ie. nothing will arrive at mail.domain.com. Hopefully I explained the complexity clearly enough. Do you have any other tips of advise? Again, many thanks in advance.
The line I was looking for is: Code: transport_maps = hash:/etc/postfix/transport in main.cf. In transport you need something like Code: domain.com relay:[mail.domain.com] where the brackets take care of MX record search. You also need Code: relayhost = testiis.test.lan to take care of all remaining relaying. Transport super seeds relayhost. Together with relay_recipient_maps the Postfix/Exchange picture is complete. If you don't want to check on users do not mention the domain, in this case domain.com, in mydestination.
