Allows users to submit rfc822 formatted email addresses
Allows users to submit rfc822 formatted email addresses

Closes #277

galihmelon/sendgrid-python,galihmelon/sendgrid-python,galihmelon/sendgrid-python,blackpioter/sendgrid-python,blackpioter/sendgrid-python,sendgrid/sendgrid-python,sendgrid/sendgrid-python,blackpioter/sendgrid-python,sendgrid/sendgrid-python