We are an Apple devices outfit, and 3/5 employees use Apple's native clients for 99% of our emailing... but having a lightning-fast, modern web client with all

We are an Apple devices outfit, and 3/5 employees use Apple's native clients for 99% of our emailing... but having a lightning-fast, modern web client with all of the features being discussed in this thread and others will be great for the 2 employees that prefer the browser and for the unique cases when we all need to log in on public devices. From the research I've done, Fastmail seems to be the only non-Exchange, non-iCloud option to get push notifications in Apple's mail clients, which is a huge plus.