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by db48x 1739 days ago
I use Gnus, which does this. It automatically turns message ids into links in both the headers and the body of the message.

It has some restrictions that I occasionally want to relax though. It doesn’t keep a complete database of all message ids it has seen in your inbox, just a list of the ones it most recently pulled into a summary. For example, if you pull up a summary that includes the latest 100 messages in your INBOX, then the links will take you to any message within those 100, but clicking on a link to a message older than that just tells you that it can’t find the message id in the summary.