What is the official way to close a forum account

I have searched the forum for ways to delete my account but it seems there is no straightforward well defined method, beyond emailing hostmaster.

What is the correct and official way to close an account?

Emailing hostmaster does not work:

status=deferred (host mail.documentfoundation.org[] said: 450 4.3.2 Service currently unavailable (in reply to RCPT TO command))

SMTP code 450 is a temporary status and implies try again later.
Mailing hostmaster is the official way.