Update again .....
Ok, using the username
Tester this time, I posted message with the phrase
viagara in the BODY of the post and also created a second post with the phrase
viagara in the SUBJECT header.
Neither one was picked up by Akismet.....
So, I guess it picks up
viagara when part of the username, but nowhere else?
Hope this helps....
Regards,
Badger
Edit: Out of curiosity, I set the option "Send extra request information" to ON and tried the above tests in this post again, however, it made no difference and Akismet failed to spot it.