fEmail: Validate error at UTF-8 encoded recipient

[edgar-obenaus]

Hi,
i want send a Mail to Sébastien Smith (ssmith@example.com)
The addRecipient Method adds correct =?utf-8?Q?S=C3=A9bastien_Smith?= ssmith@example.com, but when i want to send the mail, I got a fValidationException that the address is not a valid email address.

File: fEmail.php Line: 1701