Our company using short email alias (3 letters) and it seems to upset zimbra.. Whenever i put the alias shorter than 4 character, it gives me the following error message:

Create alias failed.
Message:  invalid request: invalid email address
Error code:  service.INVALID_REQUEST
Method:  ZmCsfeCommand.prototype.invoke

But when i test it in sending and receiving email, there seem to be no problem. Can someone advice me if using the short alias name will cause any trouble in other area?