What algorithm does PGP use to encrypt email? I know it uses RSA/DSA to create keys, but does it use that same algorithm for the actual cipher?
According to How PGP Works it uses a hybrid approach that generates a secret key for symmetric encryption.  The wikipedia page for GPG then indicates that CAST5, Camellia, Triple DES, AES, Blowfish, and Twofish are the supported ciphers.