If I'm understanding correctly, you may be interested in using our email archive widget. It's a small code snippet you can add to your website where you can add your past emails in a central place on your own site.
If you're not interested in using your website you could also use the campaign URL for an old campaign to include in your next email. It's not uncommon for some people to list their last 5 or so emails somewhere in their campaign for further reading.
Are either of those what you're looking for?
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