When Google abruptly terminated their email service to ISPs in 2015 Virgin Media moved existing email to a subfolder named [Gmail]; if this folder is not visible then subscribe to it ―in webmail select ⚙ > E-Mail > Change IMAP subscriptions…, expand all folder view and confirm all folder are selected. If the missing emails cannot be found in any of the newly subscribed to folders then regrettable they are considered unrecoverable.
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