how to bypass the prompt

[bei]

Hello:
	I'm new to gpg, using 1.0.7 on solaris.  I have obtained a public key from 
a vendor. In the process of producing my first encryption files using the 
public key, i'm getting the prompt asking me about the fingerprint, I had 
to type 'yes" to create the file. How do I bypass this and don't ask me 
about this again? I tried gpg with --yes option. it seemed like that it 
didn't work.  What should be the correct syntax?  ( tried with "gpg -ear 
--yes vendor_key_name " )
========================================================
echo "my friend, " |gpg    -ear vendor --yes >testbea.pgp
gpg: A499C5CD: There is no indication that this key really belongs to the owner
2048g/A499C5CD 2001-07-11 "vendor"
              Fingerprint: EAF2 2028 F179 67A2 F574 AAAA E725 8831 AAAA C5CD

It is NOT certain that the key belongs to its owner.
If you *really* know what you are doing, you may answer
the next question with yes

Use this key anyway?
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thanks.

Bei