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This is a limitation of the receive connector of the MS Exchange Server. It only allows a certain number of simultaneous connections from a single IP. The default value is 20.
You can query the value for your receive connectors on the Exchange Powershell:
Get-ReceiveConnector -Identity <connectorname> | fl MaxInboundConnectionPerSource
To change the value you can use the following command:
Set-receiveconnector - identity "CONNECTOR_NAME" -MaxInboundconnectionPersource 100
Please restart the Microsoft Exchnage Transport service after changing the values.
It seems you are missing the correct OLE DB Provider.
To correct this you have to go to this website from Microsoft and download the Access Database Engine 2010 in 32-bit.
Make sure you download and install the 32-bit version since the database connection is not supported with the 64-bit version.
The requested name is valid, but does not have an Internet IP address at the name server. This is not a temporary error. This means another type of request to the name server will result in an answer.
No such host is known. The name you used is not an official host name or alias. This is not a software error, another type of name server request may be successful.
Check that you have a name server(s) and/or host table configured. If you are using a name server(s), check whether the server host(s) are up (e.g. try to ping the server(s)). You could also try to resolve another host name you know should work, to check if the name resolution server application is running.
Current category: SmartPOP2Exchange