how to tell if getting unauthorized mail relaying?
I am really new to mail administration and I need some help. I am running sendmail version 8.11.6 and in my root mail I get messages saying that there were problems sending out some mail messages. it is not email that I send out and it looks like spam. I am only allow relaying through a couple domains and I assumed that all other relays would be rejected. Is this true? How can I tell how secure my sendmail daemon is?
Any help is greatly appreciated. Thanks in advance.