added optimised OS codes

CNP/Wireshark/SMTP/mail-sender.py

@@ -0,0 +1,14 @@
+import smtplib
+from email.message import EmailMessage
+
+# the email message
+msg = EmailMessage()
+msg['Subject'] = 'CNP Assignment Email'
+msg['From'] = 'aadit@example.com'
+msg['To'] = 'shreyas@example.com' # used example.com just to not have a DNS error.
+msg.set_content('Hello World. This is a message that is to be captured for the CNP FISAC II.')
+
+#SMTP server running on localhost on port 25
+with smtplib.SMTP('127.0.0.1', 25) as server:
+    server.set_debuglevel(1)  # debug output to see the SMTP conversation (for dev log)
+    server.send_message(msg)

CNP/Wireshark/SMTP/smtp-server.py

@@ -0,0 +1,33 @@
+import asyncio
+import uvloop
+from aiosmtpd.controller import Controller
+
+# handler that just prints the message content
+class PrintHandler:
+    async def handle_DATA(self, server, session, envelope):
+        print("Message from:", envelope.mail_from)
+        print("Recipients:", envelope.rcpt_tos)
+        print("Message data:")
+        print(envelope.content.decode('utf8', errors='replace'))
+        print("End of message")
+        # Respond with a success code
+        return '250 Message accepted for delivery'
+
+# uvloop for better performance
+asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
+
+def run_server():
+    # SMTP server controller, binding to localhost on port 25
+    controller = Controller(PrintHandler(), hostname='127.0.0.1', port=25)
+    controller.start()
+    print("SMTP server running on port 25. Press Ctrl+C to stop.")
+    try:
+        # Run forever
+        asyncio.get_event_loop().run_forever()
+    except KeyboardInterrupt:
+        pass
+    finally:
+        controller.stop()
+
+if __name__ == '__main__':
+    run_server()