mail imap

Hello,

I've configured an IMAP Account in Apple Mail on MacOS Mojave and also on my iPhone (Both devices synced via apple-id).

When I delete an Email in Apple Mail on my _iPhone_ in my IMAP Account, the deleted Mail vanishes from Inbox in Apple Mail on my Mac, iPhone and also on IMAP-Server (checked via WebFrontend). This is what I expected.

Now the Problem: When I delete a Mail in Apple Mail on _MacOS_, then the Mail only vanishes on MacOS, iPhone but not on the IMAP Server (Checked via WebFrontend).

The Account Settings in Preferences for the IMAP Account in Question are the same on both Devices.

Is this a Feature, Known Problem?

Kind regards, T