There are a bunch of people having this issue. I reported it in another thread as well. It all started really back around the release of WordPress 4.6 and Jetpack 4.2. Then they did some fixes just after 4.2 and everything was working again for about a week or so, maybe slightly less. I post every single day through a scheduled post. That is where I’m seeing this issue. Are @maccast, @katkag59, and @enricamatt – are each of you getting this from scheduled postings? When I post manually, everything goes out fine to my subscribers and to my social media. But if I schedule, which is what I normally do, the blog posts at its normal time to my site, but none of the subscribers get their email and none of my social media goes out. So I then have to delete my post, and then re-add it, and then publicize manually. Unfortunately, the Jetpack team is on hiatus until the 26th for some reason. Not sure if they are all on vacation or what not. But I believe this is a server issue on their end. But please do confirm if (a) you are using scheduled posts, and (b) is your carrier anyone in particular that hosts your site? Mine is GoDaddy and I’ve occasionally seen issues because its them…but in this case I don’t think it is.