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
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