I have a user setup to what appears to be send on behalf of another user, but when they try and send a email they get the following error. You are not allowed to send this message because you are trying to send on behalf of another sender without permission to do so. Please verify that you are sending on behalf of the correct sender, or ask your system administrator to help you get the required permission. I granted them rights through the EMC and mail flow.. any help would be great.. they are all in the same domain just different OU's

check if you done all the configuration accorind to this http://www.shudnow.net/2007/08/12/send-on-behalf-and-send-as/Raj

Hi, Also check if you can see the sendOnBehalf user here: get-mailbox TargetMailboxID | fl GrantSendOnBehalfTo Run this command in EMS (shell) and see if your required user is there. Regards,Laeeq Qazi|Snr Software Engineer(Exchange + Sharepoint + BES + DynamicsCRM) www.hostingcontroller.com

I ran the script and it shows the users i added.. but still doesn't work.

Hi,Please go through the below web document.http://nitec.biz/__oneclick_uploads/2009/05/send-as-send-on-behalf-and-mailbox-sharing-for-exchange-2007-mailboxes.pdfAlso i request you to go through the below informations. http://technet.microsoft.com/en-us/library/aa996881.aspxhttp://technet.microsoft.com/en-us/library/dd421852.aspxHave a good day, Sachin Shetty| MCP|MCTS|MCITP-EMA|