FAQ & Knowledge Base

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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.

Please also see MSDN: https://docs.microsoft.com/en-us/Exchange/mail-flow/message-rate-limits?redirectedfrom=MSDN&view=exchserver-2019#message-throttling-on-receive-connectors

It seems you are missing the correct OLE DB Provider. 

To correct this you have to download the Access Database Engine 2016 from Microsoft. Make sure you download and install the 32-bit version.

Or use this direct download link.

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.

The server quota ran out. The server refused a connection because there are currently too many users connected to the server. Try again later.

No connection could be made because the target machine actively refused it. This usually results from trying to connect to a service that is inactive on the foreign host.

So either you tried to connect the wrong host, or the service (SMTP, POP3, IMAP) you're trying to contact isn't available. Check the destination address you are using. If you used a host name, did it resolve to the correct address? It's also possible that the remote services use a different port number.

A connect or send request failed because the connected server did not respond properly after a period of time. Check, if the destination address is a valid IP address. If you used a host name, did it resolve to the correct address?

An operation on a socket or pipe was not performed because the system lacked sufficient buffer space or because a queue was full.
This error indicates a shortage of resources on your system. It can occur if you're trying to run too many applications (of any kind) simultaneously on your machine. If it persists, exit Windows or reboot your machine to remedy the problem.

A connection was forcibly closed by a peer. This normally results from a loss of the connection on the remote socket due to a timeout or a reboot.

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