[cafed00d]

There are only two acceptable solutions to this problem:

1. No error message. Just recover the cached message.

2. The message is deleted

There’s a world we live in where ahem-ahem a certain design focused company would’ve done it this way.

Ultimately, it’s the responsibility of the Mail app to make a decision on whether to recover the cached message or not. It’s those engineers & designers who built that damn cache in the first place. And the server too.

Let _them_ deal with the consequences of messages existing in one but not the other. It’s not the user’s job to care.