Transport problem with postfix (mysql, courier, sasl) on Debian

Hello,

I followed the tutorial on http://www.howtoforge.com/virtual_postfix_mysql_quota_courier.

It's a nice tutorial, BUT, the transport functionality doesn't work.

I want to mail [email protected]. First the mail has to go to server A and than to server B (10.0.0.2) (mx records are right). When I set in the transport table --> x.com and smtp:10.0.0.2 <-- I got error messages saying the mailserver (server A) won't relay (relay access denied).
When I put the x.com domain in the domain table, the mailserver complains about no virtual mailbox being available (which is normal).

When I add this line in main.cf, it works -> relay_domains = x.com
But why isn't it in the howto?

 

You must put [email protected] into the users table.

 

And what if I want to forward whatever address @x.com to the other smtp server? Isn't there an easier solution?

If I have to create a user, I think it will create a virtual mailbox too, and that's not what I want to do.

 

I have no idea, bit it worked for me the way described in the tutorial.