Disable 'Considered UNSOLICITED BULK EMAIL, apparently from you'

If you want to get rid of messages with this subject sent by the amavis installation of your mailserver, you need to edit /etc/amavis/conf.d/20-debian_defaults

$final_banned_destiny = D_REJECT;

Don’t forget to restart you amavis service using

sudo /etc/init.d/amavis restart

That’s it! Cheers,
iss