sendmail: host name lookup failure

[justin_brody]

Hi,
I'm trying to get sendmail going on my gentoo box. It seems to be doing fine delivering local mail, but delivering to outside addresses doesn't. It either gives me a host name lookup failure error; or it seems to try to relay through the localhost which doesn't work. Relevant lines of /var/mail/log:

Oct 3 17:51:12 sunya sendmail[28702]: j93LpCG7028702: Authentication-Warning: sunya.zero.
net: justin set sender to br@math.umd.edu using -f
Oct 3 17:51:12 sunya sendmail[28702]: j93LpCG7028702: from=br@math.umd.edu, size=64, c
lass=0, nrcpts=1, msgid=<200510032151.j93LpCG7028702@sunya.zero.net>, relay=justin@localho
st
Oct 3 17:51:12 sunya sm-mta[28708]: j93LpCSI028708: from=<br@math.umd.edu>, size=375,
class=0, nrcpts=1, msgid=<200510032151.j93LpCG7028702@sunya.zero.net>, proto=ESMTP, daemon
=MTA, relay=sunya.zero.net [127.0.0.1]
Oct 3 17:51:12 sunya sendmail[28707]: j93LpCG7028702: to=jdbr@gmail.com, delay=00:00:0
0, xdelay=00:00:00, mailer=relay, pri=120064, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, st
at=Sent (j93LpCSI028708 Message accepted for delivery)
Oct 3 17:51:52 sunya sm-mta[28710]: j93LpCSI028708: to=<jdbr@gmail.com>, delay=00:00:4
0, xdelay=00:00:40, mailer=relay, pri=120375, relay=smtp.comcast.net, dsn=4.0.0, stat=Defe
rred: Name server: smtp.comcast.net: host name lookup failure



Here's my sendmail.mc:
divert(-1)
divert(0)dnl
include(`/usr/share/sendmail-cf/m4/cf.m4')dnl
VERSIONID(`$Id: sendmail-procmail.mc,v 1.2 2004/12/07 01:59:31 g2boojum Exp $')d
nl
define('confDEF_USER_ID',"8:12")dnl
OSTYPE(`linux')dnl
DOMAIN(`generic')dnl
define(`SMART_HOST', `smtp.comcast.net')dnl
MASQUERADE_AS(comcast.net)dnl
FEATURE(`allmasquerade')dnl
FEATURE(`masquerade_envelope')dnl
define(`PROCMAIL_MAILER_PATH',`/usr/bin/procmail')dnl
FEATURE(`smrsh',`/usr/sbin/smrsh')dnl
FEATURE(`local_lmtp',`/usr/sbin/mail.local')dnl
FEATURE(`local_procmail')dnl
define(`PROCMAIL_MAILER_FLAGS',`procmail -Y -m $h $g $u')dnl
define(`PROCMAIL_MAILER_ARGS',`procmail -Y -m $h $g $u')dnl
DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
MAILER(procmail)dnl
MAILER(local)dnl
MAILER(smtp)dnl
Cwlocalhost


And /etc/hosts:
127.0.0.1 sunya.zero.net sunya localhost


Don't really know what I'm doing - any help would be greatly appreciated!

Thanks,
Justin

[Pete M]

Justin

From your logs you seem to have a DNS issue

[justin_brody]

Hi Pete,
Thanks for your response. Here's what I get from dig:

[justin_brody]

Well, I followed the example at http://davespicks.com/writing/programming/sendmailhostlookupfailure.html and this seems to work for me. Can anyone verify that the actualy problem is that Comcast doesn't have an MX entry for their own mail server???
-Justin

[Pete M]

Justin

Try it this way using square brackets this will prevent sendmail doing a MX lookup

[Pete M]

Sorry Justin

Did'nt read your post, been doing something else, glad you solved it

Pete