Where do I set the email domain?

[Jane_Jojo]

I saw this: What sets the domain in the Email Settings? - #14 by MicahZoltu, but it didn’t look like it was answered.

I don’t see it in containers/app.yml.

I get this error while testing

[MarcP]

It seems you are missing a line:

DISCOURSE_SMTP_DOMAIN: my.domain

Side note: You’re also missing: DISCOURSE_NOTIFICATION_EMAIL: noreply@my.domain

[supermathie (Michael Brown)]

You don’t need to set it - this is the smtp domain which is the HELO domain.

The error indicates that the service you’re trying to use hasn’t verified your domain, which is a different problem entirely.