Sorry but what do you mean there aren't "any reported issues". Two other Users have reported the same problem in this thread and I've lodged a Ticket.
Unfortunately the response I got from MOCA was a form response telling me it's all probably my fault.
Sorry but I've been sending these emails to the same customers every week for years and so when they all get rejected in the first run after an update, kind of suggests that not only did I not suddenly changed all my email settings overnight but neither have my customers.
Very disappointed that clearly there has been no investigation at all of a problem that has resulted from the software update. What am I now supposed to do?