bug: Revolt docker container cannot talk to postfix smtp server at localhost:25 about self-hosted HOT 7 OPEN

I went and checked the code, and the problem seems to be due to the fact that quark panics if all of the SMTP variables are not set and the UNSAFE_NO_EMAIL flag is not set, even if some of those SMTP variables (the password, in this case) aren't relevant.

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I could move this to the backend repo

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If I set the password to an empty string, it doesn't crash, and can attempt to send emails, but it doesn't appear to succeed in sending them:

docker[204592]: revolt-api-1            |  ERROR rauth::config::email_verification                       > Failed to send email to [email protected]!
docker[204592]: revolt-api-1            | lettre error: Connection error: Cannot assign requested address (os error 99)

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Apparently, this is due to a service running in a docker container not being able to recognize localhost. Switching SMTP_HOST to host.docker.internal or my server's IP address (behind the router) changes the error to:

failed to lookup address information: Name or service not known

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I don't know how to resolve this error, but it doesn't seem to step from Revolt.

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Okay, so I resolved all the explicit errors, so Revolt SAYS that it was successful in sending the email, but nothing ever happens. What assumptions does it make about the setup of the SMTP server that might be causing this?

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Apparently, this is due to a service running in a docker container not being able to recognize localhost. Switching SMTP_HOST to host.docker.internal or my server's IP address (behind the router) changes the error to:

host.docker.internal is only for Docker Desktop (macOS and Windows).
There’s no easy nor fancy way to join host, but using its main IP.
What you could do is running that Postfix in a container too and having a network for both backend and Postfix.

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