On Mar 30, 2010, at 3:05 PM, brian moore wrote: > On Tue, 30 Mar 2010 14:13:27 -0700 > Terry Barnum <te...@dop.com> wrote: > >> Other ideas why those clients didn't get rejected before DATA? > > ESMTP Pipelining? > > They could very well be rejected before DATA, except, well, with pipelining > they may have already started sending the message. > > (There are quite a few spam clients that use pipelining for the same reason > it was added.. it does speed up sending. Of course, spam clients also tend > to have horrible error detection and just close the socket when they get an > error, and sometimes just close it after sending the end-of-data marker > without > even bothering to see the response... not like they care if the address is > valid > or not.)
Thank you for the explanation. It's what I imagined to be the case, poorly written spam clients (well, poorly written from a good-is-correct pov, but spammers would likely disagree with that definition.) -Terry
