Encrypting for a user who has a IDEA public key

[mconahan at zixtestott.com]

Hi everyone,

    I created a PGP keypair using a PGPCorp desktop client, where the 
key used the IDEA cipher.  I then exported the public cert, and 
successfully imported it into GnuPG.  I then was able to encrypt a 
message for the PGPCorp user, and the PGPCorp user was able to decrypt 
the message with their private key.  Is this expected behaviour of 
GnuPG?  I thought GnuPG does not support the IDEA algorithm in any 
form.  Could someone please shed some light on this?