I am trying to prevent Exchange from sending emails from addresses that do not exist in the organization. For example sales@somedomain.com is a valid email address setup in Exchange and should send emails. However aslkjs38@somedomain.com is not an email address assigned to any users however the Exchange server will still send the emails as long as someone logs into the server with a valid user account and password. They have made it apparently impossible to find the actual user account that is sending the emails so I would like to prevent Exchange from sending emails that aren't associated with a user account and also matching the users account that logged in. Also if anyone knows how to find the users security account that is actually sending an email in the queue that would be helpful as well.
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