AltDB bouncing emails

I've been trying to get some super old entries removed from altdb, however the db-admin email bounces:

The mail system <>: host[] said: 550
5.7.1 Unable to relay (in reply to RCPT TO command)

Is there another contact here?

Also, if anyone from Internap/ is around... I've been trying to find someone with a clue to remove some IRR entries, ref ticket 3190091