Quest Issue: Bard NPCs giving mail quests shouldn't be in game until May 1999 patch era

[Dolalin]

None of these level 25 bard mail quest NPCs are associated with any other quests. The emails I've seen from eqbards shows they were new NPCs.

I think if you take the list from the Going Postal wiki link above Nilbog and disable all those NPCs you should be good.