Hi @pavan kumar ,
Is the newly created receive connector create a dedicated Receive connector for anonymous relay? If not, please following the steps to create a receive connector for anonymous:
1.In the EAC, navigate to Mail flow > Receive connectors, and then click Add . This starts the New Receive connector wizard.
2.On the first page, enter the following information:
3.In the Network adapter bindings section, if the Exchange server has one network adapter, and doesn't segregate internal and external traffic by using different subnets. The default Network adapter bindings are fine. This represents the IP and port that the server will be listening on for connections. Multiple receive connectors on the Frontend Transport service can listen on the same port of TCP 25.
4.In the Remote network settings section, remove the default IP range from the Remote network settings, and then add in the specific IP addresses or IP ranges that you want to allow anonymous SMTP relay from. It’s not recommend adding entire IP subnets that contain other Exchange servers as this can cause issues with server to server communications.
5.Then we could run the following command to configure the connections as anonymous:
Set-ReceiveConnector <> -PermissionGroups AnonymousUsers
Get-ReceiveConnector <> | Add-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights "Ms-Exch-SMTP-Accept-Any-Recipient"
For more specific steps, please refer to :Create a dedicated Receive connector for anonymous relay
About Load Balancing SMTP Traffic information, this article may help you better understand:Issues With Load Balancing SMTP Traffic
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