We have an issue i hope you can help with
We presently use exchange 2010. However we have noticed an issue with us occasionally being blacklisted
Upon investigation, we found that the cause of this issue was that some users, during the course of their work, were testing sending emails and using the exchange server as an smtp relay
The problem with this however, it that in their wisdom, they are using made up domains to send from, hence the black list
Is there any way to stop this and ensure that if they do send test smtp emails, they are only allowed if it is from our domain?