everything going to scheduler must be "jsonifiable". Can you use the
attachment parameters pointing to a physical file (as
'/yourapp/private/something.png') and in your "send_mail" function retrieve
the path and initialize an attachment ? A string is definitely
jsonifiable....
e.g.
def send_mail(to, subject='None', message='None', attachment=None):
attachment = Mail.Attachment(attachment)
mail.send(......, attachment)--
