R. David Murray added the comment:

I'm not entirely sure why some of the conversions are done they way they are, 
but I do know that one goal is to make all of the line endings consistent, 
whatever may be the case on disk.  If you aren't modifing the mailbox, nothing 
should happen.  If you are, rewriting it to be consistent would seem to me to 
be the correct thing to do.

If you want to propose a patch that optionally guesses the line discipline of 
the input file and uses it on rewrite, we'll consider it, but I'm really not 
sure it is worth it unless it actually simplifies the existing code and/or 
makes it more consistent, while still meeting the existing behavior of handling 
mixed line endings in the input files.

----------
type: behavior -> enhancement
versions:  -Python 2.7, Python 3.3, Python 3.4, Python 3.5, Python 3.6

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<http://bugs.python.org/issue30412>
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