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Question

I am unable to send email from django app (502 Bad Gateway error)

Posted May 19, 2020 1.2k views
NginxEmail

Hi there,
Its been days and I am stuck.
Whenever I try to send email, I get “502 Bad Gateway” error.
Configuration:

EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST = 'golf.mywebsitebox.com' 
EMAIL_HOST_USER = '' 
EMAIL_HOST_PASSWORD = ''
EMAIL_PORT = 465
EMAIL_USE_TLS = True

I am using Ubunto OS with Nginx and Gunicorn. I have opened ticket twice with this issue but no one is responding.
Hope someone here responds.

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mahawaqar9875
By:
mahawaqar9875
edited by bobbyiliev

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1 answer
bobbyiliev May 20, 2020

Hi there @mahawaqar9875,

There are a few things that you need to consider:

  • If you are using a firewall on your Droplet like UFW, make sure to allow the outgoing TCP traffic for port 465

  • If you are using a Cloud Firewall, make sure to allow the outgoing TCP traffic for port 465 as well

  • Once you have opened port 465, test this is actually the case by running the following command from your Droplet:

  • telnet portquiz.net 465
  • If you have port 465 open already try running telnet from your Droplet to your mail server:
  • telnet golf.mywebsitebox.com 465
  • Make sure that your Droplet’s IP address is not blocked by the firewall on your mail server

Let me know how it goes!
Regards,
Bobby

Reply Report
  • mahawaqar9875 May 21, 2020

    Hi Bobby,

    Thanks for quick response. Following your instructions, when I run 

    telnet portquiz.net 465

    I got this :

    Trying 52.47.209.216...
Connected to portquiz.net.
Escape character is '^]'.

    but when I run telnet golf.mywebsitebox.com 465, I get this:

    Trying 46.4.227.96...
telnet: Unable to connect to remote host: Connection timed out

    Now what should be my next step?
    I’ll be very thankful if you sort’ll this out.

    Reply Report
    • bobbyiliev May 24, 2020

      Hi there @mahawaqar9875,

      It looks like that port 465 is open on your Droplet.

      This means that you would need to allow your Droplet’s IP address via your golf.mywebsitebox.com mail server firewall.

      Let me know how it goes!
      Regards,
      Bobby

      Reply Report
      • mahawaqar9875 May 27, 2020

        Hi Bobby,
        Somehow my mail service provider answered me this:
        “It is SMTP service and SMTP is not restricted to certain IPs. So adding an IP is not required”.

        They asked me to change 465 port to 26, I also did that but nothing worked out.

        Reply Report
        • bobbyiliev May 27, 2020

          Hi there @mahawaqar9875,

          I tested this at my end and I actually do not get a response back on port 465 from Exim, but if I try to connect on port 26 it seems to work as expected:

          # telnet golf.mywebsitebox.com 26

Trying 46.4.227.96...
Connected to 46.4.227.96.
Escape character is '^]'.
220-golf.mywebsitebox.com ESMTP Exim 4.92 #2 Wed, 27 May 2020 12:15:11 +0500
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.

          Can you try running the two telnet commands on port 26 and see if they both work?

          Regards,
          Bobby

          Reply Report
          • mahawaqar9875 May 27, 2020

            Hi Bobby,

            Something is weird.
            My laptop basically has Window OS. When I run telnet command from window OS for port 26, it gets connected.
            But my droplet is on Ubuntu OS. When I run 

            telnet golf.mywebsitebox.com 26

            from server, it don’t gets connected. Is there is something to do over here to get it connected from Ubunto too?

            Reply Report
          • bobbyiliev June 1, 2020

            Hi there @mahawaqar9875,

            It sounds like either your Droplet has port 26 closed or that you have a Cloud Firewall enabled.

            If you have UFW enabled, can you share the output of the following command:

            • sudo ufw status

            The other logical explanation is that the mail server is blocking your IP but they’ve already confirmed that this is not the case.

            What is the location of your Droplet? I would try to spin up a Droplet in the same location and run a quick telnet test.

            Another suggestion that I could give here is to get in touch with DigitalOcean and cross check with them as well if anything could be blocking the traffic to your mail server.

            Let me know how it goes!
            Regards,
            Bobby

            Reply Report
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