I've just checked my mail server running on my VPS and it appears to be acting as an open relay.
I don't want to end up getting on a spam list somewhere, so how do I stop this?
It appears to check that the senders address is valid, but as long as it is it will let any domain send to any other domain and that's not good!
Help?
I don't want to end up getting on a spam list somewhere, so how do I stop this?
It appears to check that the senders address is valid, but as long as it is it will let any domain send to any other domain and that's not good!
Help?