I’ll risk fate’s cruel whims and state that the email issues should now be permanently fixed.
We’re no longer using a typical Web Host email service and are instead using Mailgun.com to deliver our email. Mailgun is a dedicated email delivery service, so it shouldn’t ever fail. While the first few months are free, afterwards, the cost is $0.80 per 1000 emails sent, which seems reasonable.
Special thanks to our 2 Patrons, Justus Ackermann and Jac Bottjer, whose current contributions encouraged me to explore new, more expensive avenues for email delivery. They will easily pay for more than 6500 emails each month.
Also special thanks to @Zanko who also made a very generous contribution to the hosting coffers!