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Thanks Technical! 
I’m beginning to think that the Yahoo problem may just be an anomaly - if I send an email with an eicar attachment from Outlook Express using my Yahoo account then Avast picks it up ok but nothing appears in the headers.
I’ve also managed to connect Avast to the sending of emails from forte agent (free edition) and I was feeling so pleased with myself (especially as all these things are working over an AOL connection) that I installed AOL9, Abintrusion, and Process Control all in one day.
Er, things got pretty grim so I uninstalled the lot 
Guess I’d better learn to walk before I run! 
Regards,
John