How do you know this? I thought the last letters are used to make each tell different (they change them every time they send a tell, I've noticed receiving multiple tells from the same RMT, the final letters were always different), so to circumvent the spam filter (since, changing the last letters, the tell they send is different from the one they previously sent, therefore, not recognized as spam). I have no idea where you got this information about "identifying agents".
