R1:0cdf4c251853

Properly parse email replies with varied 'To' address formats

Summary:
While my client and some others send email replies with an address like
##T1+x+y@example.com##, some other clients have sent either
##<T1+x+y@example.com>## or ##"T1+x+y@example.com" <T1+x+y@example.com>##.
Properly parse all the formats we've seen in the wild.

Test Plan:
Ran the regexp against all the formats observed in the wild (see
https://secure.phabricator.com/mail/received/) and verified it parses them
correctly.

Reviewed By…