I recently checked mail stats on a server and discovered that 71% of the mail that the server handled was rejected. That means the server lost 71% of it's total resources to connections that were either malicious in nature or intended to solicit resources from individuals.  As a result I have gone into a campaign to begin dropping all subnets that I really do not need to allow connections from. Selecting Countries to Drop The criteria that I ...

Using Pre-Built Templates Add the pre-built templates for Postfix. sudo apt-get install apparmor-profiles This will load many pre-built templates that you can use. cd /usr/share/doc/apparmor-profiles/extras Now copy all of the Postfix related profiles into /etc/apparmor.d/. sudo cp usr.sbin.post* /etc/apparmor.d/ sudo cp ...