Create spamtrap and hamtrap email aliases?
When this option is set to Yes, Virtualmin will create mail aliases
named spamtrap and hamtrap for new domains. Users can then
forward spam that gets through the SpamAssassin mail filter to the
spamtrap address, which will then be used to train SpamAssassin's
learning engine. Similarly, email that is incorrectly classified as spam can
be forwarded to the hamtrap address.