How do I make it so sendmail (8.9.3) is capable of sending out mail but not receiving mail?? This is for the purpose of our web servers which should just have port 80 open, nothing else. All administration is done locally. We want to block all port 25 traffic but can't seem to do that without stopping outgoing mail.
Also, when it comes to our mail server, we are using sendmail 8.11.4, we would like to use it for outgoing mail but we have block this at this point. I can't seem to find any way to require any type of authentication before mail can be sent our. Is there a way, this allowing only registered personnel to send out mail??
