I added and deployed the UsefulSPDWorkflowActivities_0.5.0 wsp to my sharepoint site.
It has appeared in Manage features of central admin and even in the Actions of SPD.
I used the action "send email extended" in my workflow , but it is not sending any mails.
I even find the entries in the web.config under <authorizedTypes> and <SafeControls> tags.
outgoing email configuration is also fine because default "send email" action is working
Please........... provide the solution ASAP.