If you register a new account you will be sent an email, with a link to click, to confirm that your email address is valid. If you do not do this your account will not work. Please check your spam folder if you do not see this email in your inbox within a few minutes of registering on the forums.
Assuming that the emails are beginning to be automatically put in the spam folder, is the domain name being flagged as spam by whichever mail server the forum uses?
Are you asking me? I have no way to know what happens on MXs I don’t admin myself.
By mail server, I was talking about services like Mailgun.
I only have access to my own MXs, as mentioned. I have no way to answer you accurately.