Error while using Send With Document service

Hi,

I am using the send with document email service, and trying to pass an attachment (a text document). When i invoke the process using java component i get the following error:

com.adobe.workflow.engine.PEUtil logFailedFaultRouting An exception was thrown with name com.adobe.idp.dsc.email.SendMailFailedException message:Failed to send email to mail server: null:25. Cause: null while invoking service EmailService and operation sendWithDocument and no fault routes were found to be configured.

Can someone give me an idea of how to resolve this issue?

Thanks..