ASA-dev mailing list was created years ago to discuss SBSA stuff. For quite a while it was the main place for discussion.
In meantime we had team members coming and going away. Then we moved to upstream MLs.
Nowadays the only thing asa-dev is doing is sending me moderation requests to reject spam mails.
Therefore I opened a ticket to retire this mailing list. We will continue discussing SBSA stuff on EDK2/QEMU/etc mailing lists.