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From: Jesper Harder <harder@ifa.au.dk>
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Subject: Re: Format=flowed & QP
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Lars Magne Ingebrigtsen <larsi@gnus.org> writes:

> Jesper Harder <harder@ifa.au.dk> writes:
>
>> But maybe we shouldn't flow text at all unless the CTE is 8bit or
>> 7bit?  (because QP supports soft linebreaks without f=f).
>
> I'm a bit rusty in the QP area, but I can't seem to recall any soft
> line breaks in QP...  Do you have a pointer?

Well, it's not soft breaks in exactly the same sense as format=flowed.
But in QP "=" at EOL is called a soft line break.  RFC 2045 section 6.7:

    (5)   (Soft Line Breaks) The Quoted-Printable encoding
          REQUIRES that encoded lines be no more than 76
          characters long.  If longer lines are to be encoded
          with the Quoted-Printable encoding, "soft" line breaks
          must be used.  An equal sign as the last character on a
          encoded line indicates such a non-significant ("soft")
          line break in the encoded text.