Email problem with local users

[Troy Bull]

I have cygwin 1.7 installed.  Exim is installed and configured and working.

If I email to troy.bull@gmail.com it goes right through.

If I email to bull@nik it hits the /etc/aliases and gets routed to
troy.bull@gmail.com (as desired)

if I do this

ls -l | email bull

it complains that bull is an unknown user. Anyone have any ideas on
how to "fix" this issue?  Is it a problem with exim or email?

Thanks
troy

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