160005: Bad response from SMTP host xxx 530 5.7.1 Client was not authenticated

Posted: 10th March 2011 in Exchange, Sharepoint 2010, Workflow

Recently, I was trying to set up a mail activity in a SharePoint workflow which, on the front end, seem to be working. i.e no errors. However, when looking in the SharePoint logs I found the following error:  “160005: Bad response from SMTP host xxx 530 5.7.1 Client was not authenticated”

On investigation, it turns out that this can occur when trying to setup outgoing mail on SharePoint 2010 with Exchange 2007.

How do you fix it?

On the Exchange 2007 server, you need to setup a new SMTP Receiver in the Hub Transport section of the Exchange management console.

Choose New Receive Connector

 Exchange Hub Transport New Receive Connector

Specify  the name of the receive connector

Exchange_Hub_Transport_2

Specify the IP of the SharePoint server.

Make sure you check Anonymous users on the Permissions Groups tab.

Exchange_Hub_Transport_Connector_Properties_tab

Hope this helps.

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