My other account on silver server. I tested same thing on gold between my two accounts and mailing works on gold server between the accounts. But I was confused when I tried same on silver server and it keeps showing that, no matter what I tried to mail. First I thought it was because of badges, but now it cannot be that reason either. So the accounts are Mirazzea and Frozelia. On both I tested the mailing on gold and silver server users of mine.