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[Adam Bernstein <address@concealed>]

> Yes, this is possible, but (since the link is personalised to each user)
> you need to use the MailMerge feature to do it.  There is also the issue
> that some webmail systems may pre-fetch any URLs in order to test them
> (Gmail does this) which can result in users being unsubscribed simply by
> viewing the email.  Making a 'click to confirm' could help with this.

I'll echo Steve's warning - that fact is the whole frustrating reason 
that we haven't rolled out single-click unsubscribe, despite a great 
need for it among our users - but I will add one possibly simpler solution:

Instead of going all the way to an unsubscribe link, you could instead 
just add a "This message was sent to <email>" or "You are subscribed as 
<email>" to the footer. That way, the non-technical user still has much 
better information than they have now, with no risk of complications. 
We're planning to implement that compromise idea, just haven't gotten to 
it yet.

     adam

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