Example:
My account *Hagerty use command: /Mail hagerty Test --> Could not sent.
My another account *Menu use command /Mail menu Test --> Email sent
when *Hagerty use command /Mail menu test --> Could not sent email again
So you cant check is other account email registered if your own account is not email registered

True Story?

This post was edited by Hagerty on Oct 31 2012 11:53am

4 of my accs are registerd another 50 accs not

hehe, I own account "Critical" on eu

Not anymore, I double registered it back, Hahaha :--D

it's because theres some auto-set option in diablo that blocks mail from accounts (or accounts not on your friends list)
i never took the time to explore the settings and test stuff with it, thats why i say test from the account you're checking, that way it isn't able to give a false positive like you see

i don't think it matters if your acct is email reg'd or not, im pretty sure it had something to do with a 'block incoming mail' or 'block unknown users' or something along those lines, sort of setting somewhere that i havent found