I have two virus scanners running realtime . avg the free version is scanning my outlook express for virus. You can get avg free version here
http://www.grisoft.com/us/us_dwnl_free.phpsome of the features are
You can download free Updates to get the latest program virus databases.
Download, install and use AVG Anti-Virus Free Edition and get:
AVG Resident Protection
AVG Email Scanner
AVG On-Demand Scanner
Basic Scheduled Tests
Free Virus Database Updates
Automatic Update feature
Easy-To-Use Interface
Automatic Healing of infected files
AVG Virus Vault for safe handling of infected files
Basic user Interface only
Disabled Advanced Scheduling of Tests
Disabled Creating of Your Own Tests
No Technical Support
I have had six viruses at one of my yahoo email addresses i dont open anything i dont know.you can scan your attachments on yahoo,s site fo viruses.just dont try avast antivirus it reports files as viruses that are not and kept crashing my system. :-)
avg picked one of my files up as a trojan because it was called someting zip but was an excutable file woul not let me open it even though it was not a virus.