On Thu, 2005-02-03 at 20:34 -0500, Jeff Kinz wrote: > It is inadvisable for anyone using email in a professional capacity > to use any form of TMDA (whitelisting/greylisting). > > Why? Simply put, it makes possible clients, customers, contacts > and potentially valuable network points (people) have to jump thru hoops > to make an initial contact with you. Some won't bother, you'll lose. > > Here is a collection of responses to TMDA which I have seen on the web: (snip lots of anti-challenge-response stuff) I'd just add to this that challenge-response systems basically just shift the effort of keeping the user's mailbox spam-free onto other people. Sometimes it's the sender of a valid mail, sometimes it's an innocent third party that has received a challenge due to having their email address forged by a spammer or virus. Since this sort of practise is not good for the long-term future of the Internet (I don't want to receive hundreds of challenges a day, just like I don't want to receive hundreds of spams a day), my policy is not to respond to challenges for emails that I have actually sent, and to respond to them for emails I have not sent, i.e. exactly the opposite of what the C/R system user wants. The sooner the Internet is rid of these things, the better. Paul. -- Paul Howarth <paul@xxxxxxxxxxxx>
