msva-perl doesn't appear to trigger a keyserver lookup when no key is found
jamiem tried this out, and failed to validate zimmermann because his local keyring didn't have the https key.
what is "the right thing" to do if no key is locally held that matches the user ID in question, or if no local key has a valid matching User ID? When do we query the keyservers? how do we do this and avoid a denial of service?
(from redmine: created on 2010-03-12, closed on 2010-03-14)