Hello, all. I spotted issue in the Samsung email app.
I have Sky broadband and it did work for few years but before, Christams and new year modem/router started to drop connections and as I reported, sky engeneer came in and agreed with it. He replaced modem/router. And it works fine now. But last month I spoted email app stopped to synchronise for some reason. (Samsung Members app has difficulties as well with IPv6). And my suspicious come true. As I turned off IPv6 now it works. I know on old router I've turned off as well IPv6 and I forgot about it, because as you set once and it just works. So Samsung please fix issue with IPv6 protocol in email app.
Samsung Galaxy Note 20 Ultra