NFS to Mail with the file as attachment in PI 7.31 single stack

Hi Experts,

I am working on PI 7.31 single stack,my scenario is NFS to mail where PI pulls the text files and should email to constant email address with the file that picked up as an attachment which I have done through ICO no ESR objects. But the receiver channel is functioning in error and message got failed in PI. Please find the below error code:

"Transmitting the message to endpoint <local> using connection File_http://sap.com/xi/XI/System failed, due to: com.sap.engine.interfaces.messaging.api.exception.MessagingException: com.sap.aii.af.sdk.xi.srt.BubbleException: Failed to call the endpoint  [null "null"]; nested exception caused by: java.net.UnknownHostException: [smtp server of outlook]"

Please help to resolve the issue.

Thanks,

Nithin.