These posts have served their purpose, as the message source was
automatically saved to the sent items folder. In addition the newsgroup
server's virus intercept filter confirmed my suspicion that the posts I had
copied the message-source from did indeed contain virus!
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.338 / Virus Database: 189 - Release Date: 3/14/02