text: what is the best and easiest-to-manage linux os / pop / smtp server for a novice linux administrator? i am a novice linux server admin (i can us ssh, vi, cron, and understand config files), but i am willing to learn.  however, i do not have hundreds of hours to research and learn all the ins-and-outs of linux.  i need something fairly turnkey:  what is the best server software that will do all or most of the following:  - pop3 server  - smtp server  - webmail server (with good standard features, like wysiwyg editor, attachments, etc.)  - web-based end-user configuration tools  - anti-virus  - anti-spam (blacklists and whitelists & rbl support required, spam filtering logic a plus)  - authentication data stored in a database for easy management.  - pop-before-smtp authentication  similarly, i need to pick the best linux os to run this puppy on.  i would like an os with a wizard install, and one with adequate security for a publicly accessible server.  last of all, it would be great if all of the above would be freely available for commercial use.  thanks for your help! there is a fantastic tutorial on qmail at the links below. qmail is very secure and is widely used.  many developers have ported it to the application extensions you want to use, like webmail, anti-virus and anti-spam.  this should at least get you started.  good luck.