"Andrea Riela" <[EMAIL PROTECTED]> writes: >> It is possible, but not recommended. The reason is that it >> is difficult >> to reliably distinguish "failure notice"'s from other forms >> of auto- responses such as messages from "vacation" style programs. > > I don't think so. The vacation message responds with a "failure notice" in > the header? > Thanks for your support > Andrea
There are a number of auto-responding programs like the Unix 'vacation' program, and not all of them put the same things into the headers. In the general case, it is difficult to distinguish between these and various "bounce" messages. There are also other kinds of "bounce" messages which do not indicate that the sender is a spammer. For example, if a recipient's email address is temporarily not accessible due to network or server problems, mail transport agents will periodically retry deliverly. In this case, the transport agent will often send back an "information only" message to the sender stating that the mail has not yet been delivered, and that it will continue to try to send it over a period of time. Many times, this resending will soon result in a valid delivery. That's why it is difficult to programmatically distinguish between "valid" bounce messages and those which indicate that a recipient would likely be a spammer. -- Lloyd Zusman [EMAIL PROTECTED] _____________________________________________ tmda-users mailing list ([EMAIL PROTECTED]) http://tmda.net/lists/listinfo/tmda-users
