We don't provide support for emailing everyone at once. That's a lot of users to email all at once. Normally you'd put those through a newsletter like system so the emails can properly queue up and send with crashing the server. I suppose you could use Joomla's mass mailer though since it's ACL based and not user-selection based, but I would be careful here as again it might crash your server.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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