mail relay

Hello,

just downloaded mail_relay plugin but when I tried to activate the plugin I received the following error:

Failed to save enabled features : The plugin Mail Relay cannot be used : The Postfix configuration does not have any Transport Mapping tables defined

Any idea ?

And one another question regarding the Mail Relay, when emails are "relayed" within Virtualmin, are they scanned for SPAM and VIRUS before relayed to another SMTP server ? this is very important case...

Amel