* Executing filter rules: filter rules should be executed on the server because a battery powered device with possibly an unstable internet connection is not suitable for this.
* Widget to read e-mail: widgets do not allow user interaction, so a widget to read e-mail would not be very useful.
* Swipe left/right to go to previous/next message: swiping also selects message text, so this would not work reliably.
* Local search: searching on the server is almost always faster and using less battery power.
Since FairEmail is meant to be privacy friendly, the following will not be added: