I can't see how this is a viable solution to spam. If enough servers start implementing this technique, the spammers will simply try to send more than once, hence mimicking legitimate servers. Also this seems to be a method that will increase the amount of traffic that generated by email over the net, especially if it catches on - and the spammers start doing this too...
james kearney. > Graylisting (see http://projects.puremagic.com/greylisting/ for a full > description) involves logging each incoming piece of mail and rejecting > it with a 451 (Try again later) message. After a specified period of > time has elapsed for a specific piece of mail, the server will accept it > normally. Unlike legitimate SMTP servers, spammers rarely try to resend > rejected mail and are effectively blocked. For a spammer to circumvent > the graylist, he has to incurr the cost of resending rejected mail---a > very expensive process for millions of emails. > > It is my understanding that, by the time a mailet is executed, the email > has already been accepted. Hence, my problem. > > Thanks, > Dick Dowdell > > > > > Steve Brewin wrote: > > >Dick Dowdell wrote: > > > ><snipped> > > > > > > > >>One of the most promising techniques, to me, is graylisting > >>(http://projects.puremagic.com/greylisting/). It won't block > >>any mail > >>from properly configured legitimate mail servers while increasing the > >>processing costs of any spammer who wants to circumvent it. However, > >>given the way James works, I can't see any way to implement a > >>graylisting mailet. If I'm wrong, I'd appreciate someone setting me > >>straight before I waste time building a filter in front of James. > >> > >> > > > >What are the issues you are seeing that prevent this using matchers and > >mailets in James? If you enumerate the problems maybe someone can suggest > >solutions. > > > >-- Steve > > > > > > > > > > > >--------------------------------------------------------------------- > >To unsubscribe, e-mail: [EMAIL PROTECTED] > >For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
