Hi, In the domain network of our work some users cant receive a net send message. Sender receive the error 2273. We use the net send with username instead of computername or IP because we need to do it. We solve some cases changing the logon name of these users on active directory, but I dont think this is a good solution. The computers are Windows XP Pro SP3 with Messenger service running. Suggestions are welcome :) Thanks, regards.