mattupstate/flask-mail — pull request #83 by quantus (2014-08-29 07:50:07+00:00)
Title: Sanitize sendmail's to_addrs parameter

This allows sending emails to addresses containing non-ascii characters.

My problem was with code
```
mail.send_message(recipients=[u'Pekka Pöyry '], ...)
```
that failed with error `UnicodeEncodeError: 'ascii' codec can't encode characters in position 11-12: ordinal not in range(128)` inside sendmail function.