The nature of our service is that we send a lot of emails: site reports, payment receipts, alerts, password resets, canceled and expiring subscriptions notices... thousands upon thousands of these things, every single day. Any service that sends a high volume of email will get misflagged as spam by some blacklists and/or ISPs.

This is usually the cause of not getting an email you were expecting. Check your spam folder. Even if it's not in there, there's a reasonable chance the email was flat out rejected by your mail provider because of strict suchety such rules on their mail server.

The other main cause of not getting automated emails is that your account email is out of date! Check it on your user settings page.