If the missing emails where in folders no longer shown then sign into webmail and:
- go to ☰ > Settings > ▸ Email
- scroll to foot of page and select Change IMAP subscriptions
- select ▸ to expand folder view and repeat for all other occurrences
- confirm all folder are selected, i.e. they are ticked (✓)
- select Save
- select Email (located top left of page)
if the missing emails are not found in any of the newly shown folders and cannot be found elsewhere, i.e. Trash folder, then regrettably they are not recoverable.
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