From: viatrix-usenetting@purelymail.com   
      
   On 2023-04-20T19:12:04+0100, Colin Randall    
   wrote:   
      
   > hi ... i'm curious how you knew (could tell) it had 'flowed format' ?   
   > or is it possible TB has provided this as an option in a recent   
   > update ? i would've expected to have encountered this issue with   
   > Mozilla tools previously   
      
   I could tell because my newsreader has an option to view the raw source   
   of a message, and your messages from Thunderbird had the following   
   Content-Type header:   
      
   Content-Type: text/plain; charset=UTF-8; format=flowed   
      
   (note the "; format=flowed" at the end)   
      
   I think Thunderbird's used Format=Flowed as its default when sending   
   for decades now, but it often goes unnoticed as Format=Flowed tries to   
   be as unobtrusive as possible (however the "space-stuffing" was, in   
   fact, intrusive here). I believe some mailing lists have had problems   
   with Thunderbird due to its use of Format=Flowed too.   
      
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   =knmz   
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