Discussion based lists tend to require subscription to post, but many
support lists don't. Though I suppose the attacker would need to get
subscribed to the support list to act on the confirmation message, which
makes that path harder and less likely.

One solution would be to add a 'spam' filter to the 'victim' list to
look to see if the message is coming from a mailing list and then either
hold or reject them, maybe with a white listing before if there are any
lists it is suppose to be subscribed to.

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