Create new domain but cannot login

Question

I'm using Directory Server 5.2, Messaging Server 5.2, IDA 45
I installed Messaging Server and I'm using domain itc.my, then I created several accounts under the new domain and it worked fine..I can login, sent and receive emails..then I decided to create a new domain, stud.itc.my using the command imadmin domain create...
imadmin domain create -D serviceadmin -d stud.itc.my -H mailhost.itc.my -n itc.my -w xxxx
I managed to create the domain....then I add several new user accounts under the new domain using the IDA...when I try to login Messaging Server using the new accounts, it's give error message
Invalid username or password
What steps did I miss to create a new domain?

Answer 1

for any domains other than the "default domain", your login must include the domain:
userid@domain
instead of
userid