log new user/company whatever to some other collection with date etc and emailed field (false by default).
And than you can browse it later, or send cron daily email ( update posts emailed to true) or so ?
As part of account creation, insert into “Register” collection consisting of user_id, time_added, emailed.
That will be part of account method and should be fast.
Than on server side from which Meteor instance u want, you can observe changes to Register collection http://docs.meteor.com/#/full/observe_changes
And react however you want to that still close to real time.