>It would be very, very nice to have an ESMTP extension that >allowed sending just the headers of an email, waiting for a >2xx or 5xx response, then sending the body.
See the CHUNKING extension defined in RFCs 1830 and 3030. It was defined 14 years ago but I don't know anyone who uses it. R's, John PS: Shouldn't that be spelled CHONGQING now? _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html
