Pyhton3 - send email failing with - "OSError: [Errno 113] No route to host"

Question

I've script written in Python3, it's doing couple of things and one of them is sending email. That's the code:

    import smtplib
    import os
    import json
    import re
    from datetime import datetime 
    from smtplib import SMTP
    from email.mime.text import MIMEText
    from email.mime.multipart import MIMEMultipart
    
    def send_mail():
    
        message = MIMEMultipart()
        message['Subject'] = mailtitle
        message['From'] = mailfrom
        message['To'] = mailto
    
        body_content = ("Text message")
    
        message.attach(MIMEText(body_content, 'plain'))
        msg_body = message.as_string()
    
        server = smtplib.SMTP('localhost')
        server.set_debuglevel(1)
        server.sendmail(message['From'], message['To'], msg_body)
        server.quit()

It's working fine on my virtual box environment but when I've put it on real testing environment I'm getting below output:

Traceback (most recent call last):
      File "send_email.py", line 166, in <module>
        send_mail()
      File "send_email.py", line 159, in send_mail
        server = smtplib.SMTP('localhost')
      File "/usr/lib64/python3.6/smtplib.py", line 251, in __init__
        (code, msg) = self.connect(host, port)
      File "/usr/lib64/python3.6/smtplib.py", line 336, in connect
        self.sock = self._get_socket(host, port, self.timeout)
      File "/usr/lib64/python3.6/smtplib.py", line 307, in _get_socket
        self.source_address)
      File "/usr/lib64/python3.6/socket.py", line 724, in create_connection
        raise err
      File "/usr/lib64/python3.6/socket.py", line 713, in create_connection
        sock.connect(sa)
    OSError: [Errno 113] No route to host

Could you pls advise what can cause the issue? Firewall settings? Missing libraries? Many thanks

score 1 · Answer 1 · edited Dec 16 '21 at 14:02

1

I resolved that issue in the end. The problem was related to the blocked SMTP port 25 on the firewall. When the port has been opened, my issue disappeared.

edited Dec 16 '21 at 14:02

ouflak

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answered Dec 16 '21 at 13:15

piooreq

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Pyhton3 - send email failing with - "OSError: [Errno 113] No route to host"

1 Answers1