On Fri, Nov 14, 2008 at 3:19 AM, <michael.dillon@xxxxxx> wrote: >> - DNSBLs break email deliverability. >> (DNSBL technology in fact ensures that the email sender is notified >> if an email is rejected, unlike Bayesian filters/content filters >> which place spam in the user's trash without notifying the senders) > > This still breaks deliverability. How? >> - DNSBLs "sit in the middle of an end-to-end email transaction" >> (see: http://www.spamhaus.org/dnsbl_function.html for >> enlightenment) > > There is a diagram under Rights of a Sender vs Rights of a Receiver > which shows that the DNSBL modifies the behavior of the Receiving > mail server. This is what I mean by "sitting in the middle of an > end-to-end (sender to recipient) email transaction. At the desire of the receiving mail site's administrator. And is not unique to DNSBLs. Any sort of spam filtering modifies the behavior of the receiving mail server. Regards, Al Iverson -- Al Iverson on Spam and Deliverability, see http://www.spamresource.com News, stats, info, and commentary on blacklists: http://www.dnsbl.com My personal website: http://www.aliverson.com -- Chicago, IL, USA _______________________________________________ Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf