Somewhere on DjB's web page is a "future" document wrt qmail where I recall that he seems to have settled on using high valued MX preferences to indicate a QMTP server. IN MX 300001 some.host means a QMTP server with a preference of 1. Or some such. Regards. At 04:00 PM 1/13/99 -0800, M Lyons wrote: >On Wed, 13 Jan 1999, Adam D. McKenna wrote: > >> @ IN TXT "qmtp" > >> I know this has been suggested before. I was wondering what was wrong with >> it.. > >IIRC, something about latency due to additional DNS lookups eating >whatever benefit QMTP would have provided in the first place. > >DJB has documented a way to abuse MX preference values to indicate that >QMTP should be tried first when connecting to a given MX. Since MX'es >need to be looked up anyway, it's only apparent cost (ignoring than the >inherent ugliness of abusing MX preferences in this way) seems to be the >potential occasional QMTP connection attempt to sites that happen to use >certain high MX preferences, but don't run QMTP server, and employ >easily-spooked firewall administrators. > > ftp://koobera.math.uic.edu/www/proto/mxps.txt > >According to qmail/future.html, a "future version of qmail-remote" will >support this (or some similar) mechanism. > >
