Unfortunately, the removal of the footer is a feature not a bug. In order to be DKIM-compatible and thus help avoid becoming classified as spammers, we can't mangle message content anymore, just like we can't mangle the Subject: line.
Ugh, o.k.
In principle, the List-Unsubscribe: headers that are now included in mailing list headers allow MUAs to offer convenient unsubscribe buttons. Not sure how many of the people who are complaining use mail agents that don't handle that.
I use Thunderbird which I imagine most people on the lists are using. I can't find where these would work to unsubscribe.
