[issue1823] Possible to set invalid Content-Transfer-Encoding on email.mime.multipart.MIMEMultipart

[Jonathan Share]

Jonathan Share added the comment:

I'm beginning to realise this is slightly bigger than I first thought
 ;-)

Trying to make a nice test case for this issue, I thought it would be a 
good idea for the parser to register a defect for invalid content-
transfer-encoding so I can test against that in the test case rather 
than fragile substring tests. Unfortunately the parser code isn't the 
easiest code to get your head around on a first look.

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