def __init__(self, sendmail, from_email):
        self._sendmail = sendmail
        self._from_email = from_email
Return the boundary associated with the payload if present.
dataset/ETHPy150Open bloomberg/phabricator-tools/py/phl/phlmail_sender.py/MailSender.__init__--crossover with--dataset/ETHPy150Open babble/babble/include/jython/Lib/email/message.py/Message.get_boundary