I am hosting the Discourse server on DigitalOcean, domain from PorkBun, mail server with MailGun. My MailGun account is activated and the domain (discourse.mydomain.com) is verified for use with mg.mydomain.com. All the DNS TXT records are in place. I have done every single troubleshooting step in the thread here multiple time; Troubleshoot email on a new Discourse install I can enter telnet on the host and send email manually without issue (https://serverfault.com/questions/49935/easiest-way-to-send-a-test-email-from-a-server-to-test-settings) The app.yml has these contents DISCOURSE_DEVELOPER_EMAILS: 'myemail@gmail.com' DISCOURSE_SMTP_ADDRESS: smtp.mailgun.org DISCOURSE_SMTP_PORT: 587 DISCOURSE_SMTP_USER_NAME: mail DISCOURSE_SMTP_PASSWORD: "12345678901234567890" DISCOURSE_SMTP_DOMAIN: mg.mydomain.com DISCOURSE_NOTIFICATION_EMAIL: admin@mg.mydomain.com When I try to run discourse-doctor or if I run ./launcher enter app then run rake 'emails:test[mail@mg.mydomain.com]' I get the following error ======================================== ERROR ======================================== UNEXPECTED ERROR Net::SMTPAuthenticationError ====================================== SOLUTION ======================================= This is not a common error. No recommended solution exists! Please report the exact error message above to https://meta.discourse.org/ (And a solution, if you find one!) ======================================================================================= Something is broken on Discourse, because I have no trouble sending the mail manually. I have been searching Google and the forums here for many hours, no solutions yet. Any ideas?

[image] wal: DISCOURSE_SMTP_USER_NAME: mail DISCOURSE_SMTP_PASSWORD: "12345678901234567890" DISCOURSE_SMTP_DOMAIN: mg.mydomain.com I’d wager DISCOURSE_SMTP_USER_NAME is incorrect - mail is probably not enough for mailgun to authenticate you. It should probably be mail@mg.mydomain.com I’d guess you think DISCOURSE_SMTP_DOMAIN is the domain of the user? It’s not - it’s the EHLO domain. You almost definitely don’t need to set it.

Something is wrong with your username/password. It’s possible that your password has a character that needs escaping like a star or a single quote, maybe (so it’ll be easiest to change the password not to include that character). See Troubleshoot email on a new Discourse install

the password does not contain any of those characters. In fact its the auto-generated password from MailGun, and only has letters and numbers and a few ‘-’ characters. Its quite long.

That was my best guess. I’d try generating a new password and/or copy-pasting it again. The likelihood that this is a bug in Discourse is extremely remote.

[image] Michael Brown: I’d wager DISCOURSE_SMTP_USER_NAME is incorrect - mail is probably not enough for mailgun to authenticate you. I just realized this as well, when I tested with telnet I used “mail@mg.mydomain.com” as the username and it worked, so I will try it again with that as the DISCOURSE_SMTP_USER_NAME I’d guess you think DISCOURSE_SMTP_DOMAIN is the domain of the user? It’s not - it’s the EHLO domain. You probably don’t need to set it. not sure I follow what this means for MailGun I was using mg.mydomain.com, for Discourse I was using discourse.mydomain.com. I dont actually have any DNS records set at the moment for mydomain.com, only for the Discourse subdomain and the TXT records for the MailGun DNS

oh yeah also when I tested with telnet, I was indeed able to send the email from all of the following addresses mail@discourse.mydomain.com mail@mydomain.com mail@mg.mydomain.com Not sure which one I am actually supposed to be using? Does it matter?

[image] wal: Not sure which one I am actually supposed to be using? That depends on your setup and what you want your mail flow to look like.

its working now, thanks all for the help :slight_smile: the solution was to use DISCOURSE_SMTP_USER_NAME: mail@mg.mydomain.com instead of DISCOURSE_SMTP_USER_NAME: mail

Email does not work; Net::SMTPAuthenticationError

Product Support Self-hosting

supermathie (Michael Brown) July 23, 2024, 8:34pm 7

Remove the line for DISCOURSE_SMTP_DOMAIN, you almost definitely don’t need it.

It’s used during SMTP negotiation as the HELO/EHLO domain.

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Email does not work; Net::SMTPAuthenticationError

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