[imp] gpg private key problems

[Marcin Klimowski]

I have recently fired up gpg support in my IMP installation, but when
I try to sign any message i get this entry in logs:

gpg: no ultimately trusted keys found

I can view detailed information about my private and public key in the
IMP pgp options, and my imp identity email address is included there.

what should I do to make this work ?!
is there any option not to check trustdb by httpd server when
encrypting the message ?

-- 
Marcin Klimowski