Hi James,

the built-in encryption uses S/MIME.
GPGMail uses, if so selected, PGP/MIME to send emails.
The two standards are very similar in the way an email is built, but the 
encryption algorithms differ.
While GPGMail uses gpg to process messages, S/MIME uses SSL Certificates to 
process messages.

To setup Mail.app both parties need to apply for an SSL certificate at an SSL 
Authority and exchange
the public parts of the certificate. After that, Mail.app will display an icon 
for encrypting and signing.

If you're on Lion and running the latest alpha of GPGMail, you'll see that the 
both UI's look pretty much
the same now.

Hope that clears things up a little.

Cheers,

Lukas

Am 21.10.2011 um 03:36 schrieb Cutler James R:

> I've been a happy GPGMail user for some time.  Recently, I have been 
> requested to use the built-in encryption capability in OS X Mail.  Is there 
> any coexistence between these methods or are they exclusive?  I have not 
> found the explanation on line.
> 
> Thanks.
> 
>       Cutler
> 
> James R. Cutler
> [email protected]
> 
> 
> 
> 
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