What is the best way to protect my internal mail server from SMTP attack?
If you sign up with Sentinare, you can block access from the public internet to your server (port 25). By setting up your firewall/router ACL (access control list) to allow mail connections originating only from Sentinare’s network, you can achieve maximum protection for your internal server. You will be essentially immune the next time a security bug is found for your MTA of choice.
