Hi Gurdeep,
I'm have more knowledge with SEP versus SAV (even though I've been using SAV since version 8). I don't recall MHT attachments being an option with SAV (I could be wrong) with my latest experience with 10.0.6. As I recall, the email notification I got from SAV had all of the information I needed (name of file, path, infection, etc.). Is there a specific reason you're looking for MHT attachments? It sounds to me from your original post that you may not have email notifications set up properly to begin with (I vaguely remember configuring this on the auto protect / scan options to email the infection information to me).