ssh and smtp server

smtpserver.py

@@ -0,0 +1,40 @@
+import smtpd
+import email
+import asyncore
+import threading
+
+class SMTPServer(smtpd.SMTPServer):
+
+    def __init__(self, addr='0.0.0.0', port=25):
+        super().__init__((addr, port), None)
+        self.listen_thread = None
+        self.verbose = False
+        self.on_message = None
+        self.is_running = True
+
+    def process_message(self, peer, mailfrom, rcpttos, data, **kwargs):
+        if self.verbose:
+            print(f"SMTP IN: {peer=} {mailfrom=} {rcpttos=} {len(data)} bytes, extra:", kwargs)
+        if self.on_message and callable(self.on_message):
+            mail = email.message_from_bytes(data)
+            self.on_message(peer, mailfrom, rcpttos, mail)
+
+    def start(self):
+        if self.verbose:
+            print(f"SMTP server running on: {self._localaddr[0]}:{self._localaddr[1]}")
+        try:
+            while self.is_running:
+                asyncore.loop(timeout=1, use_poll=True)
+        except KeyboardInterrupt:
+            self.close()
+
+    def start_background(self):
+        self.listen_thread = threading.Thread(target=self.start)
+        self.listen_thread.start()
+        return self.listen_thread
+
+    def stop(self):
+        self.is_running = False
+        self.close()
+        if self.listen_thread:
+            self.listen_thread.join()