Can't create a single letter email user
My primary email address for my zoho free email account is (some letters replaced with "*"):
dk*@da***********.com
I am trying to create an additional user with email address (also some letters replaced):
d@da***********.com
and I get an error "User already exist in your org"
however, if I try to create:
k@da***********.com
it works.
Why can't I create a user with single letter "d"???
thx for any advice!