Mike Glover added the comment:
Further research shows that email.parser.Parser is not handling the affected
lines correctly -- the leading '\n ' is not being stripped from the header
value.
Attached is the (ugly, worksforme) function I'm using to workaround this problem
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New submission from Mike Glover :
The attached file demonstrates the incorrect folding behavior I'm seeing.
Header lines of a certain total length get folded after the colon following the
header name, which is not valid RFC. Slightly longer or shorter lines are
folded corr
