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Any address on the SpamHaus PBL list should be blocked from unauthenticated SMTP traffic. All other traffic is not included in the PBL. If the address showed up on the SpamHaus DROP list, it should be treated as malicious and all traffic dropped. 184.108.40.206/16 is only showing on the SpamHaus PBL list so Zoom traffic can be safely allowed.
Zoom worked with SpamHaus and had 220.127.116.11/16 (and others) delisted yesterday from the SpamHaus PBL list. I'm not aware of any Zoom IPs on the DROP or eDROP lists. Your Zoom clients should be operating properly now. If you are still experiencing trouble, you may want to have your firewall team reset sessions to get the latest SpamHaus list. I believe the longterm answer is to not filter ALL traffic based on the SpamHaus PBL list - this list is only meant for filtering unauthenticated SMTP (email) traffic. The SpamHaus DROP list is for malicious IPs where all traffic should be dropped.