Postfix relay

Hi Jamie,

I see there is a virtualmin-mailrelay package. Currently I use a script based on http://macnugget.org/projects/postfixrelaymaps/ so there is as little backscatter as possible. Does the virtualmin-mailrelay also do something like this
relay_domains =
hash:/etc/postfix/relaydomains_for_stevie,
hash:/etc/postfix/relaydomains_for_chet
relay_recipient_maps =
hash:/etc/postfix/relayaddresses_for_stevie,
hash:/etc/postfix/relayaddresses_for_chet

Some customers run there own mailserver but want to use our mailserver as relay. Off course I don't know the valid e-mail addresses of this server but is there an easy way to add these domains to our relay server?

Thanks,
Martijn