>From a security perspective, Ale's proposal is flawless. But I don't like solutions that make the recipient bear most of the costs of the list's actions. Unmunging creates a high cost of entry for new domains:
Under a collaboration solution, the subscriber goes to her email support and says,"I joined list X, and they say that for the best user experience, we need to configure a whitelist entry to bypass From Filtering on messages from one SPF-verified SMTP address. Then I need to give them a response whether this change has been implemented or not." Under an unmunging solution, the subscriber conversation is more like this, "I joined list X, and they say that for the best user experience, we need to configure an unmunging MTA. Hope this is not too much trouble. I hope you can get this implemented quickly." Doug Foster
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