I recently updated to the latest version and now the tag (avast! Antivirus: Inbound message clean etc)
which is normally in the body of the email now becomes an attachement on some emails. Why is it that some are different to others, it really does not make any sense.
I use outlook 2003. Not sure about your question regarding HTML or text. I recieved an email from the same customer on the 25-6-07 and the tag (avast! Antivirus: Inbound message clean etc) was in the body of the email. The one i recieved 15-8-07, from the same customer, the tag was placed as an attachment (in the form of text) along with a PDF file.
Sometimes, something could avoid to ‘add’ anything to the email body and then avast adds as an attachment.
Can you post more about that particular email (which domain it comes from, if there is these lines X-Antivirus: avast! (VPS XXXXXX-X, XX/XX/2007), Inbound message and X-Antivirus-Status: Clean in the header of it (Right click the message, choose Properties and Details), etc.?