install and setup IMAP and POP3 over SSL
* module_apt, module_backupninja, module_monit, module_mysql, module_nagios, module_runlevel, module_shorewall, module_sshd, module_wordpress
Augeas is a lovely tool that treats config files (well, anything really, but it's mostly about config files) as trees of values. You then modify the tree as you like, and write the file back.
a long and thorough introduction to puppet