Behavior on mail server error

[mat-m]

Is your feature request related to a problem? Please describe.

When I click on a message, the body area says "Not Found". If I select Delete, I got a toaster "Could not delete message".
I can't know if error is from NC or from the mail server.
When the error comes from the mail server, an indication would be great, and maybe even a behavior change for better visualization. Clicking on the refresh button when in the mailbox does nothing

Describe the solution you'd like

At least an error toaster saying mail server is not responding.
Add a warning sign before the account.
Maybe disable commands, and add or replace them with a "retry connection" button, more visible than the default one ?

Describe alternatives you've considered

Reading the logs, I can see "Error when communicating with the mail server."
But I only can do this as I am an admin. Standard users cannot.

Additional context

Error from server could be very temporary (wrong second) or longer (server crash needing a cold restart). I can't tell what is the best way to handle all cases.

[ChristophWurst]

Is the mail server down or is this an artifact of #9168 and the mail server actually not finding the requested message?

[ChristophWurst]

Closing due to the lack of response

[mat-m]

@ChristophWurst Sorry, missed the notification during holidays.

IMAP Server could not reply at the moment of the request. I could see it through the native web UI of the mail provider.