How to continue a Send Mail task,if error occur

Hi

I have a send mail task in my WF,the send mail task is sending Email to a outlook email address. It finds the email adderss from the a partner function in sales order.In some cases if the task does not find a email address WF return the error and all further procesing of the WF stops. My WF also has subsequent tasks after the send mail task.

I want to execute the subsequentt task if the send mail task returns error.

Any ideas on on how to do this ?

Thanks

Swapnil