Thanks! That explains why I couldn't find any info about it :)
I checked our email logs to find out when we last sent notification emails to some of your subscribers, and it seems that they received a notification email on July 15, at 20:28 UTC.
I can't find that post on your site, though. Did you delete it, or did you change its publishing date?
If some of your readers didn't receive any email, could you contact me via this form and give me a few examples of the email addresses that didn't receive any notification? Do not hesitate to mention this thread in the email, so I can follow up with you.
Thanks!