Well, once the block was put in place, yeah, any email sent from the effected DH IP(s), be they discussion lists or not, would have bounced back to you. But what DH was talking about disabling are the email aliases that forward mail one way to one or more addresses.
Yes, I have an opinion.
Get a minimum 50% off with the "haveadreamyday" promo code, and... have a dreamy day. Original, no?