Date: Mon, 29 Oct 2001 14:03:08 -0600 From: James.Graham@hurlburt.af.mil To: doc@freebsd.org Subject: FAQ error regarding sendmail's nodns feature Message-ID: <C52171B401FED4119C3D06204840E3F7023C0B62@vexwsups03.hurlburt.af.mil>
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The FreeBSD FAQ (online at FreeBSD.org) reads:
8.22. How do I use sendmail for mail delivery with UUCP?
:
:
FEATURE(nodns)
:
:
The nodns and nocanonify features will prevent any usage of the DNS
during mail delivery.
Note that as of sendmail 8.7.0, this is no longer true: nodns is a
no-op. The following is from http://www.sendmail.org/m4/features.html:
nodns We aren't running DNS at our site (for example, we are
UUCP-only connected). It's hard to consider this a
"feature", but hey, it had to go somewhere. Actually,
as of 8.7 this is a no-op -- remove "dns" from the hosts
service switch entry instead.
Btw, this last instruction doesn't seem to work, and I've yet to find
a way to get sendmail to stop attempting to use DNS.... The result,
of course, is that I have yet to get sendmail to work correctly on my
FreeBSD system except when my PPP connection just happens to be up
and running, and in fact, gave up and left all e-mail services on my
old Linux box (which has an older version of sendmail...that I've yet
to get to compile on FreeBSD[1]).
Of course, the other problem with their instruction is how to limit the
effect to sendmail. On my old Linux machine, sendmail will use DNS if
it's there...but otherwise, it won't wait around to see if a DNS server
magically appears out of thin air---it just decides to try later. When
DNS is there (i.e., when my PPP connection is up), it uses it. Same
goes for other applications.
Later,
--jim
[1] But then, I didn't exactly try very hard, either.... Btw, FWIW,
it's sendmail 8.6.12 (security hole from hell, but on a more or
less standalone system that only runs sendmail to process incoming
UUCP, handle local e-mail on the machine, and to process the
outgoing queue when PPP starts up ... i.e., it's not accepting
any incoming connects, who cares?).
--
Jim Graham, Civ. 16OSS/DOIY UNCLASS: james.graham@hurlburt.af.mil
PSTN: 850-884-6675 DSN: 579-6675 SIPR: james.graham@hurlburt.af.smil.mil
STU3: 850-884-2936 DSN: 579-2936 JDISS: graham_james@socom.ic.gov
(home: jim@n5ial.gnt.net)
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