add email_platform project template

email_platform/.gitignore

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+.pytest_cache/

email_platform/README.md

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+# Email Platform
+
+Although this email service can't send email to other people due to `server providers email port block`, it can be used to receive email.
+
+There are 2 options, but I decided to use other solution since my VPS has limited memory and disk storage:
+* https://github.com/mailcow/mailcow-dockerized
+* https://github.com/Mailu/Mailu 
+
+I'm going to make a SMTP(Simple Mail Transfer Protocol) service by myself:
+* https://stackoverflow.com/a/10850619/8667243
+* https://aiosmtpd.readthedocs.io/en/latest/migrating.html
+* https://docs.python.org/3/library/email.examples.html
+* https://petri.com/configure_mx_records_for_incoming_smtp_email_traffic/
+* https://stackoverflow.com/questions/7297373/smtp-directly-to-a-hosts-mx-record
+
+## How I did
+
+For the python part, you can simply use python to set up a `SMTP` service, which will listen to a port, for google, they use `25`.
+
+Then if you want the outside world to be able to send email to you, you have to set up a `MX record` and an `A record`.
+
+It is normally like this:
+
+```
+MX  your_domain.com          mail.your_domain.com
+A   mail.your_domain.com     192.168.3.123(your server IP address)
+```
+
+Then you could send email to your email service by specify the sender email as `admin@mail.your_domain.com`
+
+## email service example
+
+```python
+import smtpd
+import asyncore
+from typing import Any
+
+class CustomSMTPServer(smtpd.SMTPServer):
+    def process_message(self, peer: Any, mailfrom: Any, rcpttos: Any, data: Any, mail_options: Any = None,rcpt_options: Any = None):
+        print ('Receiving message from:', peer)
+        print ('Message addressed from:', mailfrom)
+        print ('Message addressed to  :', rcpttos)
+        print ('Message length        :', len(data))
+        print(data)
+        return None
+
+server = CustomSMTPServer(('0.0.0.0', 25), None) #type: ignore
+
+asyncore.loop()
+```
+
+## email sender example
+
+```python
+import smtplib
+from email.message import EmailMessage
+
+msg = EmailMessage()
+msg['Subject'] = f'Hi, you!'
+msg['From'] = "yingshaoxo@gmail.com"
+msg['To'] = "lili@gmail.com"
+
+s = smtplib.SMTP('0.0.0.0', port=25)
+s.send_message(msg)
+s.quit()
+```

email_platform/email_send.py

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+import smtplib
+from email.message import EmailMessage
+
+msg = EmailMessage()
+msg['Subject'] = f'Hi, you!'
+msg['From'] = "yingshaoxo@gmail.com"
+msg['To'] = "lili@gmail.com"
+
+# s = smtplib.SMTP('mail.weloveparty.ai-tools-online.xyz', port=25)
+s = smtplib.SMTP('0.0.0.0', port=25)
+s.send_message(msg)
+s.quit()

email_platform/email_service.py

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+from typing import Any
+from aiosmtpd.controller import Controller
+
+from email.parser import Parser
+from email.policy import default
+
+class CustomHandler:
+    async def handle_DATA(self, server: Any, session: Any, envelope: Any):
+        mail_from = envelope.mail_from
+        data = envelope.content         
+
+        try:
+            headers = Parser(policy=default).parsestr(data.decode(encoding="utf-8"))
+            content = headers['subject']
+            print(f"mail_from: {mail_from}")
+            print(content)
+        except Exception as e:
+            print(e)
+            return '500 Could not process your message'
+
+        return '250 OK'
+
+if __name__ == '__main__':
+    handler = CustomHandler()
+    controller = Controller(handler, hostname='0.0.0.0', port=25)
+    controller.start()
+    input('SMTP server running. (Press Return to stop server and exit.\n\n')
+    controller.stop()
+
+
+
+
+
+# import smtpd
+# import asyncore
+# from typing import Any
+
+# class CustomSMTPServer(smtpd.SMTPServer):
+#     def process_message(self, peer: Any, mailfrom: Any, rcpttos: Any, data: Any, mail_options: Any = None,rcpt_options: Any = None):
+#         print ('Receiving message from:', peer)
+#         print ('Message addressed from:', mailfrom)
+#         print ('Message addressed to  :', rcpttos)
+#         print ('Message length        :', len(data))
+#         print(data)
+#         return None
+
+# server = CustomSMTPServer(('0.0.0.0', 25), None) #type: ignore
+
+# asyncore.loop()