DSN: Service unavailable

[Travis Harp]

I'm getting this error over and over in my mail.log.

Sendmail hasn't been something that I've used a lot in the past so I'm a little suck on what to do.

Any ideas?



Travis

[Steven E. Protter]

Thats DNS right?

while read -r aa bb
do
ping $bb -n 1 -m 60
# this does a ping on the dns servers one ping 60 second timeout. If it fails you have lost connectivity to or have invalid dns serversr
rc=$?
if [ $rc -ne 0 ] then
echo "DNS server $bb is not available"
else
echo "DNS server $bb is available"
fi
done < /etc/resolv.conf

That was kind of elaborate. Also make sure DNS setttings are correct in /etc/nsswitch.conf

Here is an example

hosts: dns[notfound=continue unavail=continue tryagain=continue]files

Also ifconfig your lan cards from lanscan and make sure they are up and on networks compatible with earlier data in this thread.

SEP
SEP

[Travis Harp]

Nope. It's DSN.

It's showing up in my /var/adm/syslog/mail.log

[Fabio Ettore]

Hi,

If you don't use sendmail:

# vi /etc/rc.config.d/mailservs

export SENDMAIL_SERVER=0

Normally that flag should be 1, you set it to 0.

Otherwise suggestions of SEP will be useful surely!

I hope this helps you.

Best regards,
Ettore

[Travis Harp]

We do actually use sendmail some just not often.

I get mail from the system but it's generating these errors at a ridicules rate, thousands an hour currently.

Does anyone know where to configure the DSN service?

[Rainer von Bongartz]

This link should help to configure DSN

http://www.sendmail.org/~ca/email/dsn.html

Regards
Rainer

[harry d brown jr]

Travis,

have a look at these links:

http://list.cobalt.com/pipermail/cobalt-users/2001-December/060446.html

http://lists.evolt.org/archive/Week-of-Mon-20001218/022147.html


live free or die
harry

[James A. Donovan]

I've seen this message in the past from my systems when the SENDMAIL_SERVER_NAME variable is set to a fully qualified domain name.

When the system reboots, the /sbin/init.d/sendmail script will set the DH and DM macros to the value of SENDMAIL_SERVER_NAME.$m. Sendmail resolves $m to your domain. So what ends up happening is sendmail tries to send out e-mail to mailserver.foo.bar.com.foo.bar.com

[Berlene Herren]

Travis, take a look at this RFC to further explain DSN messages, it may help you troubleshoot the problem:

http://www.faqs.org/rfcs/rfc1894.html

Regards,
Berlene