[2021-06-30 14:22:41 +0000] [17] [ERROR] Error handling request /register
Traceback (most recent call last):
  File "/simplye_venv/simplye_app-2zo-yRvq/lib/python3.9/site-packages/gunicorn/workers/gthread.py", line 271, in handle
    keepalive = self.handle_request(req, conn)
  File "/simplye_venv/simplye_app-2zo-yRvq/lib/python3.9/site-packages/gunicorn/workers/gthread.py", line 323, in handle_request
    respiter = self.wsgi(environ, resp.start_response)
  File "/simplye_venv/simplye_app-2zo-yRvq/lib/python3.9/site-packages/flask/app.py", line 2069, in __call__
    return self.wsgi_app(environ, start_response)
  File "/simplye_venv/simplye_app-2zo-yRvq/lib/python3.9/site-packages/flask/app.py", line 2054, in wsgi_app
    response = self.handle_exception(e)
  File "/simplye_venv/simplye_app-2zo-yRvq/lib/python3.9/site-packages/flask/app.py", line 2051, in wsgi_app
    response = self.full_dispatch_request()
  File "/simplye_venv/simplye_app-2zo-yRvq/lib/python3.9/site-packages/flask/app.py", line 1501, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/simplye_venv/simplye_app-2zo-yRvq/lib/python3.9/site-packages/flask/app.py", line 1499, in full_dispatch_request
    rv = self.dispatch_request()
  File "/simplye_venv/simplye_app-2zo-yRvq/lib/python3.9/site-packages/flask/app.py", line 1485, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
  File "/simplye_app/util/app_server.py", line 47, in decorated
    v = f(*args, **kwargs)
  File "/simplye_app/app.py", line 88, in register
    return app.library_registry.registry_controller.register()
  File "/simplye_app/controller.py", line 647, in register
    hyperlink.notify(self.emailer, self.app.url_for)
  File "/simplye_app/model.py", line 1822, in notify
    body = emailer.send(email_type, to_address, **template_args)
  File "/simplye_app/emailer.py", line 186, in send
    return self._send_email(to_address, body, smtp)
  File "/simplye_app/emailer.py", line 192, in _send_email
    smtp.starttls()
  File "/usr/local/lib/python3.9/smtplib.py", line 774, in starttls
    self.sock = context.wrap_socket(self.sock,
  File "/usr/local/lib/python3.9/ssl.py", line 500, in wrap_socket
    return self.sslsocket_class._create(
  File "/usr/local/lib/python3.9/ssl.py", line 1031, in _create
    self._sslobj = self._context._wrap_socket(
ValueError: server_hostname cannot be an empty string or start with a leading dot.