The 'Insert Note into Clean Message' Option removed - This option is greatly depreciated in that it is easy to fake and these fake 'email scanned by XXXX (insert AV of choice) and found to be clean have been used in malicious emails in the past and who trusts that anyway, I certainly don't.
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If this is something you absolutely must have then you will have to do it manually:
- You can do it by modifying the C:\Documents and Settings\All Users\Application Data\AVAST Software\Avast\EmailShield.ini (XP location) or C:\ProgramData\AVAST Software\Avast\EmailShield.ini (Vista, Win7). Note these folders may be hidden.
Find these values InsertNoteCleanMsgIn=0 and InsertNoteCleanMsgOut=0, InsertNoteInfectedMsgIn=0 now change the =0 to =1 (you only need to do that for the ones that you want to have the Note inserted). Now save the changes, the avast! Self-Defence Module will ask for confirmation, answer Yes.