Tag Archives: connector

Fix: Exchange error 0x800ccc6c – Verify that the mailbox exists and that the Exchange receive connectors are configured properly

When having especially SBS 2008 with the POP3 Connector to retrieve mail from an outside mailbox to your internal Exchange server, you may encounter the below error in the Event Viewer.

An error occurred while delivering mail to ‘mailbox@mydomain.com’ on the SMTP server ‘localhost’. The error code was 0x800ccc6c. Verify that the mailbox exists and that the Exchange receive connectors are configured properly.

Thou the error message is misleading, this problem can happen if the POP3 Protocol Errors meet the tolerance of the Exchange SMTP Receive connectors. Exchange will close an SMTP connection after a certain number of protocol errors. The default is 5.

To solve the issue, in my case I had to in increase the value of “MaxProtocolErrors” for the Exchange SMTP Receive connectors from Exchange Management Shell by using the below command.

Set-ReceiveConnector -identify “Name of Connector” -MaxProtocolErrors 999

After this, I have restarted the POP3 Connector retrieval of messages and it worked.

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How to: Allow application to relay through Exchange server

When having applications to explicity relay mail inside or outside your network with Exchange server you might have some problems. This can be solved by creating a Receive connector in your Exchange infrastructure. This can be done as below:

Open Exchange Management Console
Navigate to Server Configuration and Hub Transport
Select the server
Right click on the Receive connector area
Select New Receive Connector
Enter the name for the connector
Select Custom
On the Local Network settings click Next
On the Remote Network setting enter the IP address or range from where the emails will be sent
Once created open the properties of the connector
Open the Permissions Group tab
Tick Anonymous Users and Exchange Servers
Open the Authentication tab
Tick Transport Layer Security (TLS)
Tick Externally Secured (for example, with IPSEC)

Try to send the email and there you have it.

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