How to send email with smtpd.SMTPServer?

Question

Python

There is a SMPT server in python. They accept mail from the client.

SERVER

import smtpd
import asyncore


class CustomSMTPServer(smtpd.SMTPServer):

    def process_message(self, peer, mailfrom, rcpttos, data, mail_options, rcpt_options):
        
        print('Receiving message from:', mail_options)
        print('Message addressed from:', rcpt_options)
        print('Receiving message from:', peer)
        print('Message addressed from:', mailfrom)
        print('Message addressed to  :', rcpttos)
        print('Message length        :', data)


server = CustomSMTPServer(('localhost', 25), None)

asyncore.loop()

CLIENT

import smtplib

HOST = "localhost"
SUBJECT = "Test email from Python"
TO = "[email protected]"
FROM = "[email protected]"
text = "Python 3.4 rules them all!"

BODY = "\r\n".join((
    "From: %s" % FROM,
    "To: %s" % TO,
    "Subject: %s" % SUBJECT ,
    "",
    text
))

server = smtplib.SMTP(HOST)
server.sendmail(FROM, [TO], BODY)
server.quit()

Letters from the client come. But how to transfer them to gmail for example? Help please
There is a dedicated IP and there is a domain. if necessary. What else is needed ?

Answer 1

The STMP server receives the letter, and then, as an SMTP client, sends it to gmail. What is not clear here?