Everybody who's ever been a road warrior and trapped behind a hotel or ISP that
gratuitously snarfs up port 25 and then mangles your mail knows what I mean...
That's why network guys set up port 587 SMTP support, or ...even
worse... authenticated port-80 SMTP relays on an otherwise idle machine
in your NOC. Since its not for general consumption it doesn't need to be
easy or automatic as long as it works.