Inbound Email is Getting a Response of 530 5.7.1 Client was not authenticated.

  • 7020453
  • 21-May-2014
  • 07-Aug-2017


Using SMTP Scanner
Exchange Email System


I've just set up GWAVA as a SMTP scanner against my Exchange server and incoming email is being rejected for the following: '530 5.7.1 Client was not authenticated'.


If inbound email is being rejected because of '530 5.7.1 Client was not authenticated', this rejection is from a permissions setting on the Exchange server.

1) Open Exchange System Manager or Exchange Management Console and select Hub Transport under the Server Configuration section.

2) Here, locate your default receive connector (don’t do this on a send connector or you will create an open relay), right click it and then click on Properties.

3) At the Properties dialog, check the box for Anonymous users. This allows for another mail server to communicate with yours over smtp since that other server is basically just running through the message dialog we worked through earlier while telneted into the host.

4) Click Apply to save the changes.

5) Stop (disable) and start (enable) the connector.

Inbound email should now be received without the not authenticated response.

Additional Information

This article was originally published in the GWAVA knowledgebase as article ID 2295.