script: #!/usr/bin/env python3 import smtplib
host = 'localhost' port = 25 connection = smtplib.SMTP(host=host, port=port) connection.ehlo() connection.quit()
result: Traceback (most recent call last): File "/opt/mailman/./testone.py", line 7, in <module> connection = smtplib.SMTP(host=host, port=port) File "/usr/lib64/python3.9/smtplib.py", line 255, in __init__ (code, msg) = self.connect(host, port) File "/usr/lib64/python3.9/smtplib.py", line 341, in connect self.sock = self._get_socket(host, port, self.timeout) File "/usr/lib64/python3.9/smtplib.py", line 312, in _get_socket return socket.create_connection((host, port), timeout, File "/usr/lib64/python3.9/socket.py", line 856, in create_connection raise err File "/usr/lib64/python3.9/socket.py", line 844, in create_connection sock.connect(sa) ConnectionRefusedError: [Errno 111] Connection refused