Thank you all for your replies,which really helped for beginners like me in many ways,and we still need your help to grow, Thank you..
Am new to Business Workflow,I am having a scenario to send messages to SAP-USERS within SAP.
I tried to send a message,with no idea i added a SAP-USERS name in the RECIPIENT list,and the message was sent.
Now i have to send message from my program (assume when the user clicks the 'SUBMIT' button),
is there a function module for this(this is the main part) ???
Could you please tell me some more about Business Workflow??,
for sending external mail what else should i configure??