As I expected, new email apps do not stop coming. This time new app from EasilyDo
In addition, the new EasilyDo Mail app offers several unique features aimed at differentiating its app from other alternative mail clients on iOS, including tools to detect and prevent email tracking, ways to quickly unsubscribe from newsletters and automated mailings, email snoozing, and faster search, to name a few.
Many of other email clients have many of mentioned, so I'm not sure how much differentiation that would be.