Date: Thu, 12 Oct 2000 11:57:10 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: Bill Fumerola <billf@chimesnet.com> Cc: John Baldwin <jhb@FreeBSD.org>, Warner Losh <imp@village.org>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org, Doug Barton <DougB@gorean.org>, Tony Finch <dot@dotat.at>, Jeroen Ruigrok van der Werven <jruigrok@via-net-works.nl>, Jordan Hubbard <jkh@winston.osd.bsdi.com>, John Hay <jhay@icomtek.csir.co.za> Subject: Re: cvs commit: src/etc inetd.conf Message-ID: <200010121857.e9CIvAi30686@earth.backplane.com> References: <20001012141830.B37870@jade.chc-chimes.com> <XFMail.001012113211.jhb@FreeBSD.org> <20001012143936.D37870@jade.chc-chimes.com>
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A couple of points on sendmail -q30m
First, if you are going to run the sendmail queue the best way to do it
is via 'sendmail -q30m' or 'sendmail -q5m' or whatever, because sendmail
will be a whole lot more efficient running the queue AND because you can
tell sendmail to limit the total number of sendmails forked at any
given moment (-O MaxDaemonChildren=N). If you use cron, sendmail
processes can build-up due to network or DNS failures or large mail
queues or a combination. Believe me, you do NOT want to run sendmail
from cron.
Second, running sendmail -q30m or -bd or in any manner at all without
first setting it up isn't going to work very well... if you enable
sendmail by default, without any real setup, it will not have access
to the entire internet due to the strict rules checking that occurs on
many SMTP servers these days. Before you can run sendmail on a platform
you need to do one of two things:
(A) setup a smarthost
or
(B) make sure the machine's hostname, forward, AND reverse DNS is setup
100% properly. One mistake and a good bit of the internet will
bounce your email.
Generally speaking, when you throw a rackmount box onto the net the chances
of sendmail being able to deliver to all destinations directly from that
box are close to nil due to the hostname and/or DNS not being properly
setup. On the machines I setup at BEST and at Backplane, every box
smarthosts sendmail except one.
So there isn't much point running sendmail by default (-bd and/or -qNm)
unless the installation procedure asks for a smarthost.
-Matt
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