Is there any specific reason why HCW add AnonymousUsers permission on the Default Frontend connector? If we remove anonymous permission from the default front-end connector, will there be any issues? If this is not supported configuration, can we create a new receive connector using below command to receive email from Office 365 with anonymous permission checked?
New-ReceiveConnector -AuthMechanism 'Tls, Integrated, BasicAuth, BasicAuthRequireTLS, ExchangeServer' -Bindings '[::]:25','0.0.0.0:25' -Fqdn $hostname -PermissionGroups 'AnonymousUsers, ExchangeServers, ExchangeLegacyServers' -RemoteIPRanges "40.92.0.0/15", "40.107.0.0/16","52.100.0.0/14","104.47.0.0/17" -RequireTLS: $false -TLSDomainCapabilities 'mail.protection.outlook.com:AcceptCloudServicesMail' -TLSCertificateName $TLSCertName -TransportRole FrontendTransport -server $hostname -name "Inbound from Office 365"