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SMTP's PIPELINING feature works in interesting ways..



A sample from SMTP-transporter's log shows a fairly typical case:

#    740 bytes, 498 in header, 408 recipients, 10 secs for envelope, 229 secs for body xfer

That is, feeding those 408 recipients over the SMTP link with
PIPELINING active at both ends does give considerable speed
increase at that phase, however the receiving system (PMDF 5.0)
did not ack the reception (final ".") before it had done complete
routeing, it seems..  (Not bad, 0.5 sec for each recipient..)
(Estimate on non-pipelined header transfer is in order of 2 secs
 per address, which means circa 800 secs just for the envelope.
 It may, of course, partially be compensated by routed addresses,
 and thus the body transfer will not take 200 secs..)

	/Matti Aarnio <mea@nic.funet.fi>