It didn’t help.
I had to set this aside for a few weeks and just came back to it today. I’m really stuck!
This is everything SMTP in my app.yaml:
DISCOURSE_SMTP_ADDRESS: mail.well-actually.fyi
DISCOURSE_SMTP_PORT: 465
DISCOURSE_SMTP_USER_NAME: amber@well-actually.fyi
DISCOURSE_SMTP_ENABLE_START_TLS: false # (optional, default true)
DISCOURSE_SMTP_FORCE_TLS: true
DISCOURSE_SMTP_DOMAIN: forum.well-actually.fyi
Also the password has special characters in it, which the Troubleshoot docs mention could be an issue.
Does any of this look wrong to you?