On Wed, 2 Jul 2014, Philip Prindeville wrote:

On Jul 2, 2014, at 12:37 PM, John Hardin <jhar...@impsec.org> wrote:

On Wed, 2 Jul 2014, Philip Prindeville wrote:

Given that it’s text/plain with an implicit charset=“us-ascii” and an implicit 
content-transfer-encoding of 7bit, the sequence &#x[0-9A-F]{4} doesn’t really 
parse into a 16-bit character, would it? That would be a broken MUA that made such 
a leap...

Nope. The content-transfer-encoding is only for the *transfer* part of the 
process. Once the content reaches the MUA that content can be further parsed by 
the MUA according to other encoding rules, such as these escape sequences for 
Unicode characters. That's perfectly valid. How else would you send, for 
example, a c-cedille in spanish text via a 7-bit-clean channel?

This is a trick question, right?

You do that with base64 or quoted-printable, which are the interoperable 
standards.

Apologies, you are right. I was focused on something else this morning and dashed off a fast - and wrong - answer.

--
 John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
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