On Feb 1, 2012, at 6:48 PM, Mouse wrote:
  My MUA is mostly - entirely, from some perspectives -
my own code.  My
 MTA is partially my own code; my SMTP listener is mine, but I use
 sendmail as a routing engine and first-level delivery backend.
 However, none of that is relevant.  I went back and checked again (I
 keep a separate copy of all mail that hits my inbox for some weeks).
 Here is the Content-Type: from Dave's mail, the one that I was replying
 to when I brought this up, as it hit my inbox:
 Content-Type: text/plain; charset=us-ascii
 Note the complete lack of format=flowed.  And I do get quite enough
 mail that _is_ marked format=flowed; quite aside from it not being
 designed to, there's pragmatic evidence it's not my code stripping it. 
Let me be clear: I wasn't suggesting your MUA/MTA was defective.
Someone asked the question, I was just answering my recollection. :-)
As far as Mail.app not doing format=flowed anymore, I was completely
unaware of that, and I find it kind of egregious.  It's a shame; I
rather like it in general, but it's been doing things that get on
my nerves in the most recent version, so I suppose I'll have to go
MUA shopping.  I'm not a huge fan of Thunderbird, but it does have
a much better extension architecture and doesn't lack what I would
consider important features (such as line wrapping).
- Dave