Encrypting with an message expiration date

[Allen Schultz]

GnuPG-Users:

Is there a way to force an expiration date when encrypting a message
for additional security. I have a friend who is inquiring. I've
already informed him of the "for his/her eyes only" option.

-- 
Allen Schultz <Allen.Schultz at gmail.com>
pub   3072R/DAD4736B 2009-05-20
      Key fingerprint = 16AD EFE1 D68F C8A8 B086  68CD 1A35 85C7 DAD4 736B
uid                  Allen Schultz (aldaek) <allen.schultz at gmail.com>
uid                  [jpeg image of size 6128]
sub   2048R/F55651E0 2009-05-20 [expires: 2010-05-20]
sub   2048R/5687B83E 2009-05-20 [expires: 2010-05-20]