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Removing the %3C and %3E didn't help but I think I found the problem.

I made an extremely simple test case and it all worked just fine.

But, if the message has a Resent-Message-Id: header (as most of mine do), that header seems to be the one getting parsed and used as the link instead of the Message-Id.

That's where the <20071123194851.IEE4C77C9@myaddress> style link
is coming from - it's a Resent-Message-Id:. If I replace it with the Message-Id: <1ADCB77A-A63A-4006-B156-A2E14D20C821@mysite> the link works as expected.

I can send examples if you need them.