PGP Unknown Key

Hello, I'm new to the group.

I was curious why when I read messages posted in the group through my
Outlook 2003, using PGP 9.5, I see "* PGP Signed by an unknown key", but
when I check my PGP settings I have set to Automatically lookup keys on
keyservers when verifying signatures and I have it set to save keys to my
keyring.

The only keyserver I have is keyserver.pgp.com.

Is it because the messages have keys not stored on this server? What other
servers could I add to my keyserver list?

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