Remind user to wipe mailbox if it's unreachable when unpairing

Torsten Groterequested to merge
2311-remind-to-wipe into master

If we fail to tell the mailbox to wipe itself when unpairing, remind the user that they should wipe the mailbox next time they have access to it.

Closes #2311 (closed)

Edited by Torsten Grote

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