Would a better alternative not be to not allow insecure mail servers? Why don't mail server providers disallow their programs from being open relays or have IP/Username and password restrictions in place.
I configured our mail server to only accept mail from our internal work IP address and from authorised users.
Obviously mass mail providers will only be able to impose a username and password restriction but I would say the best way is to stop people producing mail software that can be open.
I configured our mail server to only accept mail from our internal work IP address and from authorised users.
Obviously mass mail providers will only be able to impose a username and password restriction but I would say the best way is to stop people producing mail software that can be open.