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Hi Technical - and thankyou for such a quick reply! 
The reason I was considering putting Avast between Spami and YahooPops & Hotmail Popper (rather than between Outlook Express and Spami) was because I thought that if I clicked on ‘View Message’ in Spami’s Recycle Bin then it might unleash a virus that Avast hasn’t had a chance to check.
On the other hand, I really don’t know much about computers and how Spami works - is the Recycle Bin some kind of ‘safe area’ where emails can be looked at without nasty viruses escaping? (er, it might be obvious that I don’t know how viruses work!).
Also, do you know if my Yahoo emails are being scanned properly Technical? The Avast text messages in the email bodies are reassuring but I’m wondering why the Avast X-header inserts are missing.
Regards,
John Latter