Sounds if your files/email archive storage is full. Find out by logging into GIO (always from your browser's address bar or bookmarks, never ever from a link in a potentially unsolicited email), check storage.
Green Gate Grove via groups.io wrote:
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I recently received a pending email post that basically stated that my group email was 99.9 full.
I believe this to be a scam of some kind. See attached files to see what I mean.
Has anyone else received this and do we need to check out mailbox for trash?