I know the basics of DNS. I have setup small DNS networks, but am no where near an ace at this topic.
Heres the run down of my issue:
We are getting tons of messages back to our users being rejected from other domains. Someone is using our DNS records to spam other people but when those messages get kicked back, then they end up in our users in boxes. I know the reason we are getting these back is because we are the only server setup to receive the MX records for our domain (right?). But how do we stop them from spoofing our mail server? Is there anything that is able to stop someone from stealing our domain?
Thanks!
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