If you receive a signed GPG/PGP message from someone and you do not yet have his public key in your GPG/PGP keyring. You can make GPG automatically download and add unknown GPG/PGP keys of received messages by adding the following two lines to the file $HOME/.gnupg/gpg.conf:
keyserver hkp://subkeys.pgp.net
keyserver-options auto-key-retrieve
The actual link (URI) to the keyserver is only one example and may be different - you can also choose other servers.
note: on a connection with a lot latency ie a satellite connection, this will cause evolution to slow to a crawl or hang if it cannot instantly connect to the keyserver!
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