How to detect inline PGP in mails! Best practice?

[Patrick Brunschwig]

Sascha Kiefer wrote:
> Hi list,
> 
> i'm writing on a programm which verifies and decrypts messages as they
> arrive.
> It it is fully S/MIME (using M$ Crypto API) and PGP/MIME (GnuPG)
> compatible.
> The hardest problem i face is to detect inline PGP parts and handling
> them correctly:
> 
> * if the charset != us-ascii inside textmails is not always bad since
> most MTA's keep the
>  original charset; so handling the data as binary is often the best
> choice!?!
> * what about detached signatures of attachments?
> * sending a PGP/MIME to this mailing list makes it even worse
>  (see Topic: "GnuPG Clearsign vs. PGP/MIME Signing" for more details)
> * ...
> 
> Do you have some hints?