It seems, I don’t receive any messages on Mac OS. In particular, Mac OS does not receive anything on “Saved Messages” chat. Although other clients (iOS and linux) do receive the messages from Mac OS.
I also just noticed that Mac OS client has not been receiving the email notifications that I get from Steam. The last one that managed to get in was on March 16.
Is it just not able to read the email box?
I don’t see it complaining though. Next to the account/email address in top-left it does say “Connected” with a green circle. In Settings/Connectivity, it says: INBOX: Connected, DeltaChat: Connected, Last message sent successfully. And it retries the connections every time I switch to the DeltaChat window: it goes yellow and says “Connecting…” then back to green and “Connected”.
I looked at this post from 2021, but it seems the suggestions do not apply, some of the settings options are not there.