Older emails, 24 hours or more, will not open. I can click on them, then hit forward, and they appear. However, when I send them to myself, they again will not open.

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This comes up when I click on my emails older than 24 hours. However, if I select the email to forward it, it appears. However, if I resend it to myself, it again, will not open.

Any thoughts, suggestions, or cures will be greatly appreciated. Thanks very much in advance!