SMTP server that writes emails to the console.

console-smtp-server

#!/bin/sh

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

PORT=25
HOST='localhost'

import smtpd, asyncore
server  = smtpd.DebuggingServer((HOST, PORT), None)
print(f"[SMTP {HOST}:{PORT}]")
print("[waiting for email]")
asyncore.loop()

__EOF__