Just reaching out to let you know that I have tried for a week to signup on the forum with a username/password (not Github). No email confirmation link is ever received. There is a problem with the service sending the signup email link.
I finally gave up and signed up with the Github oauth.
To add to this, all these days later, this is what I use to get my mail past your spam filters:
If there’s a ‘send test mail’ option for the admins, you send an email to the temporary address listed and they spit out results, telling you how to fix it. The best you can score is a 10, which my sites do. Even weird stuff like putting an address in the footer will help get you through the various filters out there.