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spam, virtual domains



How can I prevend my qmail-server (and me) from Email spamming?
The server is setting up as a qmail-mailserver with several virtual domains.
First I will configure the server to only relay mails
which come from domains they are also configured at the server.
At the moment the server relay mails from the domain xyz@xyz.com
although the domain xyz.com ist not configured on the server.
I have read the spam section on qmail.org and the qmail Anti-Spam Howto
from Chris Hardie. But sorry, I did not found anything to this point.
Thanks for help