So are they saying that unless you use their Internet webmail site to send e-mails, this sort of problem can happen? Or do they have their own e-mail application?


On a Mac since 1984.
Currently: 24" M1 iMac, M2 Pro Mac mini with 27" BenQ monitor, M2 Macbook Air, MacOS 14.x; iPhones, iPods (yes, still) and iPads.