Gem,
Couple of things first is your mailstore on the same box as Unity or are you using the company mail store
With either you can run the Macro traces for the mailstore delivery, withing this traces you should be able to see what email address the mail is being delivered to
The other way is you can look at the folder UnityMTA folder X:\\CommServer\UnityMTA (where X is the drive letter that Unity was installed on) this is not ususually the C drive.
Looking in the UnityMTA you will be able to see any messages that have not been delivered. Unity will store these messages until it gets a valid email delivery address
Also check your alias name ties correctly with address against that with AD.
But if the message is being delivered correctly then the Macro Traces are the next step, you can then view the traces in a text editor or using the trace viewer tool
Thanks
paul
