Message 397478 - Python tracker

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Content 
Hello,

When using as_string() on a Reply-To header like the following:
msg['Reply-To'] = '"foo Research, Inc. Foofoo BarBar on Summer Special Friday: 0.50 days (2021-02-31)" <catchall@foobar.exchange.com>'

The double quote disappear, which lead to wrong header value

See attached file for example