I was getting “Couldn’t check signature” errors on XEmacs. I
uncommented the mailto keyserver in my ~/.gnupg/gpg.conf and now things work.
The public key needed is here:

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: PGP Key Server 0.9.5
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=1HP3
-----END PGP PUBLIC KEY BLOCK-----

The mailto server returned the key to me as an attachment. I pressed
pipe on the MIME part and passed it to gpg —import.

E-Mail from Server Administrator