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Filter Office 365 Connector on port 25

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I'm trying to publish a public URL on port 25 in order to connect with Office 365. As it is a public URL, I would like to filter the incoming traffic.


I used the Microsoft website as reference, but it didn't work:


*.mail.protection.outlook.com,,,, 2a01:111:f400:7c00::/54, 2a01:111:f403::/48


I created a responder policy like this

! CLIENT.IP.SRC.IN_SUBNET(,) && CLIENT.IP.SRC.IN_SUBNET( ... && CLIENT.IP.SRC.MATCHES(mail.protection.outlook.com).


But, when setting up the connector in Office365 everthing is blocked.


Can someone help me ?


Thanks in advance.

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