Eric,
Since 99% of folks should be reading mail with a tool which handles clicking on mailto URLs, another list I'm on goes ahead and puts (un)subscription info in the headers in that form, so the feeble-minded need only click on the appropriate mailto. Frex., for the GD, put something like the following in the headers:
List-Subscribe:
<mailto:glorantha-digest-request_at_chaosium.com?subject=subscribe>
List-Unsubscribe:
<mailto:glorantha-digest-request_at_chaosium.com?subject=unsubscribe>
This assumes you're using majordomo, and don't need any additional parameters for either command. Even if they are needed, the requester can just add them manually.
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