> On Mar 26, 2017, at 4:52 PM, Alberto Bertogli <[email protected]> 
> wrote:
> 
> There are lots of advantages of using JSON for this. It is well defined,
> standard and there are lots of well tested and widely used
> implementations.
> 
> It is used widely, it's familiar to many people, and its shortcomings
> (which are not few, admittedly) are well understood and documented.

Sure JSON is used widely in all kinds of software, but NOT in MTAs,
and STS is for MTAs.

> It support rich types (such as lists), and common libraries already
> handle difficult situations like non-ascii content, long integers,
> multi-line strings, malformed/malicious input, etc.

Sure in Perl, Python, Go, ... but Sendmail, Qmail, Postfix and Exim
are in C, and already have code to handle ESMTP attr=value lists, and
don't currently use JSON.  The extra features of JSON you mention are
not needed for this specification, and over-engineering to use JSON
is IMHO not useful.

-- 
        Viktor.

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