On Fri, 9 Jul 2004, Marques Johansson wrote:
> Is it possible to configure exim to use pipelining when sending email to
> other servers?
No, because Exim will do so automatically if the server advertises
pipelining. However, you can *stop* it using pipelining by setting
hosts_avoid_esmtp in the smtp transport.
> Would the effect be any different than a client side version of
> 'smtp_enforce_sync false'? Is it known that pipelining is improves
> performance?
1. Yes. The client has to send a whole bunch of commands and then
process the results as they come back, and take note of "expected"
errors (e.g. a rejection of DATA after all RCPTs are rejected is
"expected" and not a real error).
2. I believe so. It reduces the number of TCP/IP round trips,
significantly for small messages. I guess it matters less if all your
messages are M$word monstrosities. :-)
--
Philip Hazel University of Cambridge Computing Service,
ph10@??? Cambridge, England. Phone: +44 1223 334714.
Get the Exim 4 book: http://www.uit.co.uk/exim-book
