We have recently fixed a problem that was preventing outgoing mail from being delivered promptly. As the backlog of undelivered mail clears, this may cause you to be surprised by older comment notifications, payment receipts, and other unexpected mail that wasn't delivered at the proper time. We apologize for any confusion this may cause. Please allow time for the backlog to clear; this may take several days because of the volume of mail we have yet to send out.
If you are still missing current mail and wish to open a support request about it, please include in your request a link to a comment that was not received in the last 24 hours so that site maintainers may track it.
Off to do that very thing. Given that I haven't received several. If anyone wishes to do the same, you need to scroll down to the bottom of the page and click on 'Ask a question'.