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I knew that Google always blocked the sending and receiving of a virus but I had never thought to see what happens if you try to send a virus. A Google Blogoscoped visitor sent in the above screenshot of what happened when he tried to send the eicar virus string to himself in a text file. After that had failed he also tried changing the extension to JPG and WMV but neither of those worked as well.
The eicar virus string is a simple string of characters that is used to test an Antivirus. In fact the string is only 68 bytes long:
While it may not be anything extravagant it is a very popular way to test your Antivirus. The code does not do anything harmful to your computer and just simulates a virus.