[luau] RH7.3 Sendmail probs

Wed Sep 18 10:10:01 PDT 2002

Under the section local info (line80 or so) you may have to make some
changes if sendmail can't figure out your hostname.

##################
#   local info   #
##################

#Cwlocalhost
Cwtiger (your hostname)

#Dj$w.Foo.COM
Dj$w.websharx.com

Also maybe line 141
#DM
DMwebsharx.com

For dns is the box using itself for dns in the /etc/resolv.conf or your isp?
If your pointing to the isp you might want to change it to yourself and
setup forwarders in your named.conf.

Lastly the specific error sounds like the person your sending to is using
the anti-spam feature that denies mail from a domain that does not resolve.
I myself was able to query your mx record  but maybe try adding a record for
websharx.com so it resovles to an ip address, not needed I know I just
thinking out loud.

----- Original Message -----
From: "Erich Schrottke" <sharky at websharx.com>
To: <luau at videl.ics.hawaii.edu>
Sent: Wednesday, September 18, 2002 12:39 PM
Subject: [luau] RH7.3 Sendmail probs

> Hi Guys,
>
> Thanks for all the advice on my post a couple weeks ago regarding redoing
> a new box.
>
> I've made the plunge and installed RH7.3, and managed to successfully
> install a 'custom' setup. I let RH installer do mysql and PHP although my
> instinct was nagging me to hand install those. I have yet to install
> Apache and FP extensions. The RHN updates are kinda spiffy (first time
> I've tried it) and with VNC it's pretty nice to be able to log in
> remotely.
>
> I'm excited about playing with squirrel mail and other toys once I've got
> the machine stabilized. I have a few more dumb questions to ask and there
> may be simple answers, but I'm not quite able to sort this out.
>
> Situation:
> ==========
> Initially the custom install put in IPCHAINS vs. IPTABLES contrary to RH
> documentation. I'm not familiar with either, but found that once I got up,
> that my DNS wasn't working (I do my own DNS for websharx.com and a couple
> of friends domains).
>
> 1 ) I did a bit of googling, and was able to figure out how to open up
> port #53 to the outside world.
>
> 2) I then had a problem with mail not coming in and opened up SMTP, but
> mail still was not coming in. Telnetting from the outside to mail port did
> not work.
>
> As a result the following lines were added to /etc/sysconfig/ipchains
> file:
>
> -A input -s 0/0 -d 0/0 25 -p tcp -y -j ACCEPT
> -A input -s 0/0 -d 0/0 53 -p udp -j ACCEPT
>
> 3) Mail still was not coming in and the port now showed on nmap scans but
> showed as being closed. After a little more googling, I commented out this
> line from the /etc/mail/sendmail.mc file:
>
> dnl This changes sendmail to only listen on the loopback device 127.0.0.1
> dnl and not on any other network devices. Comment this out if you want
> dnl to accept email over the network.
> dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')
>
> After changing DAEMON_OPTIONS to have dnl in front of it, mail started
> coming in.
>
> NOTE: Have I done something horrible and opened myself up more than
> necessary? I'd like to keep this puppy tight, but I need to serve DNS,
> WWW, and receive and send mail locally and from the outside.
>
> 4) I'm having a problem with mail being rejected from a host that I'm
> sending mail to. I can send mail to some folks, but not others. This
> particular host returns the following message:
>
> =======================================================================
> The original message was received at Wed, 18 Sep 2002 01:26:46 -1000
> from sharky at localhost
>
>    ----- The following addresses had transient non-fatal errors -----
> <xxxx at xxx.com>
>
>    ----- Transcript of session follows -----
> ... while talking to smtp-cpf.xxx.com.:
> >>> RCPT To:<xxxx at xxx.com>
> <<< 451 4.1.8 Domain of sender address sharky at websharx.com does not
> resolve
> <xxxx at xxx.com>... Deferred: 451 4.1.8 Domain of sender address
> sharky at websharx.com does not
> resolve
> Warning: message still undelivered after 4 hours
> Will keep trying until message is 5 days old
>
>     [ Part 2: "Delivery Status" ]
>
> Reporting-MTA: dns; tiger.websharx.com
> Arrival-Date: Wed, 18 Sep 2002 01:26:46 -1000
>
> Final-Recipient: RFC822; xxxx at xxx.com
> Action: delayed
> Status: 4.1.8
> Remote-MTA: DNS; smtp-cpf.xxx.com
> Diagnostic-Code: SMTP; 451 4.1.8 Domain of sender address
> sharky at websharx.com does not resolve
> Last-Attempt-Date: Wed, 18 Sep 2002 06:26:15 -1000
> Will-Retry-Until: Mon, 23 Sep 2002 01:26:46 -1000
> =======================================================================
>
> My DNS seems to be working and I basically copied the /var/named entries
> from my old RH6.2 setup over to the new one, and changed /etc/named.conf
> appropriately. Nslookup seems work inside and pinging from other hosts
> seems to work. Nslookup from the outside using websharx.com as the server
> work too.
>
> I've believe I've changed the hostname in the right places, but not sure
> if that is the issue.
>
> I have a feeling I'm missing something in my sendmail setup or my DNS
> setup that makes this host reject my mail. I can send mail to other hosts
> though, just like when I was on RH6.2. I used to send mail to this host
> regularly but with this install of RH7.3 it rejects it.
>
> Would anyone be able to help me with learning this aspect of config or
> provide insight?
>
> Any other tips you might suggest for this new install? I'm trying to keep
> only a minimum of ports open till I can get everything locked down.
>
> Thanks in advance,
> Sharky
>
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