An announcement from Yahoo Groups:

Dear Yahoo! Groups Members,

Due to a recent outbreak of computer viruses being transmitted via email messages, Yahoo! Groups is experiencing delays in delivering group messages. To improve performance, and to help reduce the spread of viruses, Yahoo! Groups has had to temporarily reject some messages.

Based on an advisory posted by a leading anti-virus company, Groups will temporarily reject messages with the following subject lines:

• test
• hi
• hello
• Mail Delivery System
• Mail Transaction Failed
• Server Report
• Status
• Error