PGPStrictKeys yes | no

Check the mail address into public keys (MYKEY)
When the user sends a message MYKEY check if the PGP public key contains ad id of sender email address.

PGPEncryptedDataAlgo (algo)

Set the GPG cencryption alogrithm
Available PGP encryptions:

AES128
AES192
AES256
BLOWFISH
CAST5
IDEA
SAFER
TRIPLEDES
TWOFISH
DEFAULT

You can spoof all PGP message version to prevent to send informations of user's software and operating system.

PGPVersionSpoofer {

    GnuPG v1.4.7 (MingW32) - WinPT 1.2.0 

    GnuPG v2.0.17 (MingW32) 

    GnuPG v1.4.7 (Darwin)

    GnuPG v1.2.4 (MingW32)

    }

Put a version string per line.