Thanks for the suggestion! I'm checking it, it is developed by an italian company too :)

Just test a bit but it seems rock solid!

Do you know if is possibile to personalize the main interface font-size and the shortcuts?

Thanks again for the advise, zapped!

Damn, snooze is not included in the business version :( I guess it is because the business version is privacy oriented and don't have any cloud sync. I don't grasp why email clients don't implement local-only snooze, it is a useful and quite easy to develop feature.