I am sending marketing emails through sendgrid smtp api via python EmailMultiAlternatives. I want to know how can I handle bounces directly from there to mark particular emails as undeliverable.

The code snippet is:

```
def send1():
    text_content = 'Hi this is the text version'
    connection = get_connection(host=EMAIL_HOST,
                                port=EMAIL_PORT,
                                username=EMAIL_HOST_USER,
                                password=EMAIL_HOST_PASSWORD,
                                use_tls=EMAIL_USE_TLS)
    connection.open()
    subject = 'Inviting {0} to join the Business Network of SMEs'.format('surya')
    html_content = template.format('Surya')
    from_email = 'sp@abc.com'
    to = 'abc@gmail.com'
    msg = EmailMultiAlternatives(subject, text_content, from_email, [to], connection=connection)
    msg.attach_alternative(html_content, "text/html")
    msg.send()
    connection.close()

```

Is it possible to get the response here only after `msg.send()` or is there some other way.