Here is where it describes it blacklisted

 3.3 RCVD_IN_PBL            RBL: Received via a relay in Spamhaus PBL
                            [37.120.193.122 listed in zen.spamhaus.org]
 1.3 RCVD_IN_BL_SPAMCOP_NET RBL: Received via a relay in
                            bl.spamcop.net
             [Blocked - see <https://www.spamcop.net/bl.shtml?37.120.193.122>]