SMTP server that writes emails to the console and appends to a log file.

logging-smtp-server

#!/bin/sh

cat << __EOF__ | sudo /usr/bin/env python3

from smtpd import SMTPServer
import asyncore
import datetime

PORT=25
HOST='localhost'

class LoggingServer(SMTPServer):

  logName = "mail.log"
  log  = None

  def __init__(self):
    global HOST
    SMTPServer.__init__(self, (HOST, 25), None)
    self.log = open(self.logName, "a")
    print(f"[appending to '{self.logName}']")

  def process_message(self, peer, mailfrom, rcpttos, data):
    
    today = datetime.date.today()
    print("-------------------------------------------------------------------------------")
    print(f"Date: {today}")
    print("")
    print(str(data))

    self.log.write("-------------------------------------------------------------------------------\n")
    self.log.write(f"Date: (today)")
    self.log.write("\n")
    self.log.write("\n")
    self.log.write(str(data))
    self.log.write("\n")
    self.log.flush()

server  = LoggingServer()

print(f"[SMTP {HOST}:{PORT}]")
print("[waiting for email]")
asyncore.loop()

__EOF__