Strange fastforward alias problem

[Piotr Wanat]

        Hello!
I recently encountered problem with creating aliases in /etc/aliases
(used with fastforward package) . When I create alias conatining
existing user username and "-" it returns mail sent to this alias with
reply: "Sorry, no mailbox here by that name". The alias looks like:
user-test or test-user, and yes - I did newaliases and all other aliases
work fine for me.
        Any clue? 

Piotr Wanat