-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Rich Kulawiec Sent: Thursday, April 24, 2008 6:57 AM To: misc@openbsd.org Subject: Re: Sendmail OpenBSD performance
On Wed, Apr 23, 2008 at 11:18:34AM -0400, Morris, Roy wrote: > I know this is not exactly a OpenBSD question but I am wondering if anyone > can give me a sense of the performance/limitations of sendmail? Basically > I have a machine that sends out 20,000 mails a day and once and a while > the application sending emails for delivery complains that it has to > wait for sendmail. I go and check the sendmail machine and it's hardly > even breathing hard. Almost no cpu usage, memory fine blah blah .. > > I am not convinced this is a problem with sendmail, just looking for > some feedback from anyone doing volume email on openbsd. >>Many MTA performance problems of this nature are not the related to >>the MTA per se, but to DNS. So much so, that it's become nearly a >>SOP to thoroughly check DNS function and performance before looking >>at the MTA. Yes, thanks I have stats running on the DNS server and dedicated bind server on each mail machine, which I would have thought plenty of horse power. >>That may or may not be your problem, but it's certainly a good place >>to start looking. Should it turn out to be the case, one simple >>mitigating strategy is to enable BIND on the sendmail machine >>(in recursive, caching mode but answering local queries only) and >>set the resolver on it to use that instance of BIND. If you're >>sending to the domains on a regular basis, the cache will become >>and remain populated with most of the DNS information required, >>which should boost query response. >>---Rsk Thanks for your input, Roy
