Sendmail absolutely refuses to accept connections from outside the network. The standard answer, dnl the DAEMON_OPTIONS line does not work. Everything looks perfect, but it just does not work.
System is Centos 5 (64 bit), using SNAT. For fun, I downloaded postfix. It works, so there is no firewall issue. I would be happy to use postfix, but I can't seem to get it to work with MailScanner.