Workflow remove Approve/ Rejects buttons from Email Notification

Hi

I want to remove Approve/ Reject buttons from Workflow Email Notification.

#WFM_OPEN_MAIL attribute with value set to WFMAIL:OPEN_MAIL_OUTLOOK is removing Approve/ Reject buttons.

But I want to set this item attribute in run-time based on some logics, i.e.

          if my logic is true then #WFM_OPEN_MAIL attribute value is WFMAIL:OPEN_MAIL_OUTLOOK

          if my logic is false then #WFM_OPEN_MAIL attribute value should be NULL

Can we use Set ItemAttr in workflow package to achieve this? Pl suggest.

Thanks