Re: The issue of mime parsing

Andrew Rutherford:
> In negotiating codecs over SIP, the idea is that in the first packet
> from the initiator, it proposes a preference list of acceptable
> codecs - basically everything it supports. In the 200 response, the
> receiver sends back just the one that they picked, which is then
> acknowledged by the initiator in an ACK.

In the context of email message content, are there any clear
advantages of this approach over using a simple
MIME/multipart-alternative for different formats? Intelligent proxy
servers could still dynamically rewrite the list of MIME/alternative
parts and reorder it after preference.

Andrew Rutherford:
> This has obvious implications when talking about "negotiating"
> acceptable encryption keys, [...]

To negotiate encryption on the "notification level" seems more
complicated than to negotiate a transfer encryption when the receiver
contact the storage to fetch a part. If we are already using keys to
ensure that only the right receiver can fetch the data, isn't the
content secured enough? What are the prime advantages?

//Rickard