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I am getting error message "OVERQUOTA" but I'm only at 52% - any fix out there?

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When trying to sent (Save to Sent), Compact, delete messages..I get this error message. Went on to Server to delete messages - deleted some...was at 60% now down to 52%. Is there a fix?

When trying to sent (Save to Sent), Compact, delete messages..I get this error message. Went on to Server to delete messages - deleted some...was at 60% now down to 52%. Is there a fix?

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Quotas are set by your provider not Thunderbird. Ask them what their error message means. Sometimes it is that you have sent too many emails.