This specifies what command to run when the server receives a WinPopup style message. This would normally be a command that would deliver the message somehow. How this is to be done is up to your imagination. An example is: message command = csh -c 'xedit %s;rm %s' & This delivers the message using xedit, then removes it afterwards. NOTE THAT IT IS VERY IMPORTANT THAT THIS COMMAND RETURN IMMEDIATELY. That's why I have the '&' on the end. If it doesn't return immediately then your PCs may freeze when sending messages (they should recover after 30 seconds, hopefully). All messages are delivered as the global guest user. The command takes the standard substitutions, although %u won't work (%U may be better in this case). Apart from the standard substitutions, some additional ones apply. In particular: %s = the filename containing the message. %t = the destination that the message was sent to (probably the server name). %f = who the message is from. You could make this command send mail, or whatever else takes your fancy. Please let us know of any really interesting ideas you have. Here's a way of sending the messages as mail to root: message command = /bin/mail -s 'message from %f on %m' root < %s; rm %s If you don't have a message command then the message won't be delivered and Samba will tell the sender there was an error. Unfortunately WfWg totally ignores the error code and carries on regardless, saying that the message was delivered. If you want to silently delete it then try: message command = rm %s csh -c 'xedit %s; rm %s' &