--On Tuesday, 23 March, 2004 08:48 -0700 Vernon Schryver <vjs@xxxxxxxxxxxxxxxxxxxx> wrote:
Perhaps it would be enough to say just that, along the lines of
... mail directly from the IP addresses of customers of X instead of via MTAs run by service providers is rejected by much of the rest of the Internet because it is almost certainly "spam" or otherwise objectionable. The terms of service of X usually require the use of MTAs operated by the service provider and prohibit the operation of MTAs at the customers' IP addresses. Practically all legitimate mail from users of X use their service providers' MTAs. Some service providers use technical mechanisms such as "port 25 filtering" to enforce their terms of service that require that their customers' mail use the providers' MTAs.
("X" because I'm not sure about factoring that text into each of the 1st three descriptions or having it one place.)
However, the above statement just isn't true unless the collection of terms and conditions I've seen are a very odd subset. "You will not run a server" is typical. "You are required to use ours" is much less common, and is often associated with a commercial motive, e.g., "you are required to use ours, and our domain on your outgoing mail, unless you pay us more money".
john
