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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!spool.mu.edu!newspump.sol.net!news-peer.gsl.net!news.gsl.net!news.mathworks.com!worldnet.att.net!uunet!in3.uu.net!192.203.206.1!news.wonderworks.com!u-sure-kin-mambo From: kyle_jones@wonderworks.com (Kyle Jones) Newsgroups: comp.mail.sendmail,comp.mail.smail,comp.unix.bsd.freebsd.misc Subject: Re: Sendmail vs. Smail... Date: 17 Dec 1996 19:21:56 -0500 Organization: Wonderworks Inc. Lines: 18 Sender: kyle@crystal.WonderWorks.com Message-ID: <597df4$i40@crystal.WonderWorks.COM> References: <57tf61$gq7@raven.eva.net> <1996Dec1510.41.00.4656@koobera.math.uic.edu> <1996Dec16.152941.1706@isac.hces.com> <1996Dec1721.54.58.11342@koobera.math.uic.edu> NNTP-Posting-Host: crystal.wonderworks.com Xref: euryale.cc.adfa.oz.au comp.mail.sendmail:35293 comp.mail.smail:2732 comp.unix.bsd.freebsd.misc:32730 > > So tell us, please, why does the RCPT cost so much time? > > [...partial explanation...] RFC 1854 (aka the PIPELINING spec) is an attempt to standardize a version of SMTP that reduces the number of response waits in the session. If you support PIPELINING and don't do DNS lookups of any hosts presented to you in the SMTP session, and don't do IDENT lookups RCPT addresses, you will go a long way toward reducing the delays. With regard to multi-RCPT performance in the face of routing flaps: Routing flaps are often the result of overloaded routing hardware. In this scenario, having a connection timeout and fail is not a bad thing. Even if it means more total traffic, the traffic is spread out, which will help a temporarily overloaded router recover.