I think they shouldn't allow people to send a tell until their character has aged a certain amount of time. RMT are not going to wait 2-3 hours after creating a character just to spam people. That's bad business for them.

Make it to where characters must be more than a few hours old before allowing them to send tells. It takes this much time to get through the initial city quests and get their feet wet in the open world for a legitimate new character.