Mail as in paper mail? Or e-mail? If the former then it takes time for a reply to come.... if any at all. The other likely could have gotten lost among stuff other people send on the daily.
Terraria Community Forums
Techhunter_Talon
Techhunter_Talon
Best worst case scenario: They read it all but don't have the time to respond to it all.
NBRI
Paper mail, yes.