First off, Betty, if you need help, please just write to me at firstname.lastname@example.org or to Lauri at email@example.com, or send a private message here in Discourse, rather than posting to TidBITS Talk. No need to clutter thousands of email boxes with a support request.
When I looked up your address in SendGrid, it showed that delivery had been stopped because you marked email from TidBITS as spam. I strongly suspect that it wasn’t you that did it, but some app or service—we’ve seen a few other people who keep having this happen too. Nonetheless, that explains why email stopped—SendGrid stops sending to any address that marks email as spam. I’ve removed your address from the spam suppression list, so you should get this and future messages.
We’re close to switching to a different email delivery service since SendGrid costs over $200 per month compared to Amazon SES, which we believe will be closer to $20 per month. Regardless of the cost, my hope is that some of the annoyances we’ve seen with SendGrid will disappear (undoubtedly to be replaced with entirely different annoyances, but such is life on the Internet).