Message 397529 - Python tracker

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Thanks David,

Here is some other tests I ran
Issuing: 
- msg['Reply-To'] = '"foo Research Inc Foofoo BarBar on Summer Special Friday 050 days (2021-02-31" <catchall@foobar.exchange.com>'

- msg['Reply-To'] = '"foo Research Inc Foofoo BarBar on Summer Special Friday 050 days 20210231   " <catchall@foobar.exchange.com>'

But:
msg['Reply-To'] = '"foo Research Inc Foofoo BarBar on Summer Special Friday 050 days 20210231  " <catchall@foobar.exchange.com>'

worked. It looks more related to the length of the name than the character used.