Hello,
today I noticed that some Exchange Online Servers are blacklisted on Backscatterer.
I only found these 2, but there might be more at this IP range:
40.107.1.100 - mail-eopbgr10100.outbound.protection.outlook.com
40.107.1.102 - mail-eopbgr10102.outbound.protection.outlook.com
https://mxtoolbox.com/SuperTool.aspx?action=blacklist%3amail-eopbgr10102.outbound.protection.outlook...
