It's in the setup to append the tag or not - I'm using the security suite, not just NOD AV but I expect it's similar.
Double click NOD in the System Tray - choose - Setup AntiVirus - Email - Configure (or similar).
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?