[Exim] Exim Error: Unroutable Address

Hi Gurus out there,


I had a problem configuring one of my client email account. My client
has a valid email account of

* wings.mungcal@???.

Then, I created an account using the following command:

* useradd -m -s /sbin/nologin wings

Then, created an alias in my /etc/exim/aliases:

* wings: wings.mungcal@???

And, run newaliases.

* 46 entries written


The problem became apparent when I invoked a test mail:

* exim -bt wings
* R: mailman_main_director for wings.mungcal@???
* wings@??? is undeliverable:
* Unroutable Address


How can I fix this problem. Pls help me.

Thanks.
neil