2010/9/21 Rony gnulinuxist@gmail.com:
The whole process looks like the md5 sum generated from a Cd/DVD ISO. The md5 can be cross checked manually using md5sum. In case of emails, the regular email client of the recipient does not make any difference between a real or fake PGP signature, so what is the point in adding it?
The point is, you can choose to verify the GPG signature if you need to, by opening it in a GPG aware email client.