I have developed an ASP.Net web application from which I want to send an email on behalf of the currently logged in user.
When attempting this I get the error message:
Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender
Does anyone know how to get round this?
We are using:
windows server 2003
Not sure about the emailing setup, I've asked the technical people there to have a look but I'm asking this question now so I can try to understand the problem.