Postfix relay alias or bcc?
 

Very quickly - I am creating a test email system for a company and I want to populate the new system with live data. Both systems are using the same email addresses as they look at the same LDAP source. And I want to make as few changes to the live system as possible. The only change I want to make is to introduce one addition smart host which will relay mail to the two systems.

So, what I need is a very simple postfix relay system that will do the following:

1. If an email comes in for email.address@domain.com it will send it to email.address@domain.com AND email.address@new.domain.com.
2. If an email comes in for email.address@new.domain.com it will send it to email.address@new.domain.com.
3. If an email comes in for email.address@old.domain.com it will send it to email.address@domain.com.

(I have already setup the new system to rewrite the addresses so it changes @new.domain.com to @domain.com)

At first I tried a combination of recipient_canonical_maps and recipient_bcc_maps, but it fails when it receives an email for email.address@old.domain.com. Instead of sending it JUST to email.address@domain.com it first changes the address to email.address@domain.com and then adds the BCC which might cause in infinite loop with the other systems.

I have also looked at using an ALIAS file, but it looks like it is only for Local Users and this machine needs to relay all mail.

I have also looked at using a virtual_alias_maps but it seems that the system does not want to send virtual domains and users via SMTP. Whenever I try I get an error:
Where my transport file is:
Thanks
Bob

Hi,

I don't know the exact configuration you need, but I would see the "relay_domains" parameter (around middle of the page) to try it.
It seems to me that is what you need ?

good luck

Thanks,

But I got the relay part working fine. The problem I am having is with the address rewriting.

Bob

I was able to get the system working by using multiple postfix instances on the same host.

I used the first (my postfix-in instance) to accept the mail and add the correct BCC addresses. Then used the second (my postfix-out instance) to rewrite the addresses and deliver the mail.

Thanks
Bob

Great !

Would you mind posting the needed configuration lines which you have set (removing/ blending any addresses)
for future references for anyone that may search for postfix.

Thank you.

Best Regards.