No email notifications

We utilize wp_mail() for our mail sending, which is an enhanced wrapper for php’s mail() function.

From my own personal knowledge, it’s never a guaranteed thing, in terms of receiving. It can help ensure that the emails are sent, but whether received and where is a different question that isn’t in our control.

Just to help be certain though, are other emails from your website being received properly and like expected?

Thanks for getting back to me.
All other emails are received properly. I ended up adding a badgeos_award_achievement filter, and its callback to send emails. It works properly.

Good to hear you worked something out, though I do admit to being curious why it wasn’t originally. Let me know if something else goes haywire.