1) Common sense : Dont open any attachments that dont come from trusted sources
2) Micro$oft: Its a huggeee security risk to use Outlook, more than you can imagine. For one, a vbs [the most common virii] dont get a confirmation, they get active on Outlook Express/Outlook, Eudora is great if u disable IE viewer
3) If urs is a corporate setup, have ur sysadmin use a mail check on SMTP & IMAP/POP servers, stuff like Trend Antivirus is fabulous, saved mine & clients skin so often
4) Lastly, depending on the level of sophistication in your server setup here are some of the things I would do/have done
- switch SMTP server from 25 to something else
- switch to web based emails thru IMP/Horde [
http://www.horde.org ]
5) Have a centralized antivirus check if u receive a high volume of emails.