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You can know how we do it if you like: https://blog.fastmail.com/2014/12/02/dec-3-push-it-real-good/ https://blog.fastmail.com/2014/12/02/dec-3-push-it-real-good... and how we do the initial load as well: https://blog.fastmail.com/2014/12/15/dec-15-putting-the-fast-in-fastmail-loading-your-mailbox-quickly/ https://blog.fastmail.com/2014/12/15/dec-15-putting-the-fast...