add a way to keep track of email addresses that were not sent

[brunoamaral]

Notes

def send_simple_message(self, to, subject, html, text, site, customsettings):
		sender = f'GregoryAI <gregory@mg.{site.domain}>'
		response = requests.post(
			settings.EMAIL_MAILGUN_API_URL,
			auth=("api", settings.EMAIL_MAILGUN_API),
			data={
				"from": sender,
				"to": to,
				"subject": subject,
				"text": text,
				"html": html
			}
		)
		return response

here we return the response

for email in subscribers_email_list:
				self.send_simple_message(
					to=email,
					subject='Weekly Summary',
					html=html_content,
					text=text_content,
					site=site,
					customsettings=customsettings
				)

here we don't do anything with that response

We can have something like this

not_sent = []
for email in subscribers_email_list:
				r = self.send_simple_message(
					to=email,
					subject='Weekly Summary',
					html=html_content,
					text=text_content,
					site=site,
					customsettings=customsettings
				)
                if r.statuscode != 200:
                    not_sent.append(email)