"Unparsable" emails result in confusing error when replying

[romanofski]

Describe the bug
When I reply to e-mails with non-ascii characters Purebred shows the email in the UI, but when I want to send the mail sendmail tells me that no receipients are given.

To Reproduce
Steps to reproduce the behavior:

1. Use a mail where it's From header contains an unquoted name with non-ascii characters, e.g. Röman Joost <[email protected]>
2. Hit Reply
3. the UI should put the former From address in the new To: field
4. When trying to send it results in an error

Expected behavior
I think it's just a matter of encoding it properly underneath vs what we're showing in the UI?