Massimiliano Torromeo <massimiliano.torro...@gmail.com> added the comment:

In case an address email header contains and empty string, the tokenizer return 
a BareQuotedString
which is also a TokenList, but this list is empty and the parser fails to check 
this and insteads raises an IndexError.

For example an email with this header will trigger the IndexError:
ReplyTo: ""

----------
keywords: +patch
pull_requests: +4558
stage:  -> patch review

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32178>
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