+Use Nessus / OpenVAS (remote network security auditor):
+
+Install software packages:
+# apt-get update
+# apt-get install openvas-client openvas-server openvas-plugins-base openvas-plugins-dfsg
+
+Add a user:
+# openvas-adduser
+
+Start openvas server (takes a while):
+# Start openvas-server
+
+Invoke client as user:
+% OpenVAS-Client
+--
+Find packages not available from any active apt repository:
+
+% apt-show-versions | awk '/No available version in archive/{print $1}'
+--
+Simple mailserver with python:
+
+% python -m smtpd -n -c DebuggingServer localhost:1025
+--