I'm hosting the web site of www.domain.com, but my site is not the true SOA for domain.com, nor is it the mx. However, my server IS an MTA for several other sites, some of which need to send mail to users at domain.com. When a mail user on my box tries to send mail to a valid [email protected] address, postfix throws the error: Code: Recipient address rejected: User unknown in local recipient table. I assume this is because, when you setup a site in ISPConfig, as well as users, it automatically adds lines to postfix's virtusertable. So postfix sees that there are domain.com addresses at the site, but not the one being addressed in this message, so it rejects the message. How do I get postfix to honor the MX of the domain before it cares about what is in virtusertable?
You can use domain.com on your server as email domain (what you are currently doing) or you set domain.com to external mailserver (in the website and the co-domain!) and all mail for domain.com will be sent to the correct mail exchanging server for domain.com and not to your local server.
I'm not sure I understand how to set it to external mailserver. I defined an external MX, but I still get the same error when sending. I can't setup mail forwards for every mail user on that domain, as I'm not in control of the mail accounts at the MX. The SOA for the domain is not my box. The domain just has an A name to my box at their external DNS server. However, after adding the site through ISPConfig, my box of course believes it is the SOA for the domain.
