E-Mail Crypto Survey

1.Which E-Mail Encryption or Authentication System are you able to use and which one would you prefer? (multiple answers possible)
Able to Use
Have used it in the past
Using it regularly
S/MIME Signatures
S/MIME Encryption
PGP Signatures
PGP Encryption
2.Which option would you prefer for ISC e-mail?
3.Any comments? (include an e-mail address if you would like us to respond)