lists.wordpress.org unsubscription email not configured

According to #5134-meta the mailing lists include unsubscribe headers similar to this, but they don’t resolve to accounts:
List-Unsubscribe: ,

wp-svn-request@lists.wordpress.org: host lists.wordpress.org[198.143.164.108]
    said: 550 5.1.1 : Recipient address
    rejected: User unknown in local recipient table (in reply to RCPT TO
    command)

#prio3

#5134-meta