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List: courier-users
Subject: [courier-users] error DNS lookup failed with working DNS!
From: PICCORO McKAY Lenz <mckaygerhard () gmail ! com>
Date: 2016-03-17 19:05:56
Message-ID: CALci+FSDvGNTNiuwujbLgBns1=6Lf4Avs3n7baMzgqw9VLJa7Q () mail ! gmail ! com
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now i have another strange problem, one of my normal machines to experiment
have courier-mta with ssl enabled, and since some time stop send mails with
following error:
Mar 17 14:04:52 syscenter courieresmtp: id=00008DE8.56EAF7A0.000019FB,from=<
root@eldominio.net.ve>,addr=<mckaygerhard@gmail.com>: DNS lookup failed.
its not a server, only a machine to experiment, but i take care due i
already not know if that can occurs some day in future on one of the
servers..
i really need some help with that, event reinstaled..
i made some test and seem its confused:
root@syscenter:/var/log# testmxlookup gmail.com
Domain gmail.com:
Relay: gmail-smtp-in.l.google.com, Priority: 5, Address:
::ffff:64.233.190.26
Relay: alt1.gmail-smtp-in.l.google.com, Priority: 10, Address:
::ffff:108.177.15.26
Relay: alt2.gmail-smtp-in.l.google.com, Priority: 20, Address:
::ffff:74.125.136.27
Relay: alt3.gmail-smtp-in.l.google.com, Priority: 30, Address:
::ffff:64.233.163.26
Relay: alt4.gmail-smtp-in.l.google.com, Priority: 40, Address:
::ffff:74.125.130.26
root@syscenter:/var/log# testmxlookup eldominio.net.ve
Domain eldominio.net.ve:
Relay: mx.eldominio.net.ve, Priority: 10, Address: ::ffff:192.168.0.56
root@syscenter:/var/log#
the command used to send was:
echo "Subject: tests" | /usr/sbin/sendmail mckaygerhard@gmail.com
i verify the host :
root@syscenter:/var/log# host eldominio.net.ve
eldominio.net.ve has address 192.168.0.56
eldominio.net.ve mail is handled by 10 mx.eldominio.net.ve.
root@syscenter:/var/log#
root@syscenter:/var/log# host gmail.com
gmail.com has address 216.58.222.133
gmail.com has IPv6 address 2800:3f0:4003:c01::12
gmail.com mail is handled by 10 alt1.gmail-smtp-in.l.google.com.
gmail.com mail is handled by 20 alt2.gmail-smtp-in.l.google.com.
gmail.com mail is handled by 30 alt3.gmail-smtp-in.l.google.com.
gmail.com mail is handled by 40 alt4.gmail-smtp-in.l.google.com.
gmail.com mail is handled by 5 gmail-smtp-in.l.google.com.
root@syscenter:/var/log#
Lenz McKAY Gerardo (PICCORO)
http://qgqlochekone.blogspot.com
[Attachment #5 (text/html)]
<div dir="ltr"><div>now i have another strange problem, one of my normal machines to \
experiment have courier-mta with ssl enabled, and since some time stop send mails \
with following error:</div><div><br></div><div>Mar 17 14:04:52 syscenter \
courieresmtp: id=00008DE8.56EAF7A0.000019FB,from=<<a \
href="mailto:root@eldominio.net.ve">root@eldominio.net.ve</a>>,addr=<<a \
href="mailto:mckaygerhard@gmail.com">mckaygerhard@gmail.com</a>>: DNS lookup \
failed.<br></div><div><br></div><div>its not a server, only a machine to experiment, \
but i take care due i already not know if that can occurs some day in future on one \
of the servers..</div><div><br></div><div>i really need some help with that, event \
reinstaled.. </div><div><br></div><div>i made some test and seem its \
confused:</div><div><br></div><div><div>root@syscenter:/var/log# testmxlookup <a \
href="http://gmail.com">gmail.com</a></div><div>Domain <a \
href="http://gmail.com">gmail.com</a>:</div><div>Relay: <a \
href="http://gmail-smtp-in.l.google.com">gmail-smtp-in.l.google.com</a>, Priority: 5, \
Address: ::ffff:64.233.190.26</div><div>Relay: <a \
href="http://alt1.gmail-smtp-in.l.google.com">alt1.gmail-smtp-in.l.google.com</a>, \
Priority: 10, Address: ::ffff:108.177.15.26</div><div>Relay: <a \
href="http://alt2.gmail-smtp-in.l.google.com">alt2.gmail-smtp-in.l.google.com</a>, \
Priority: 20, Address: ::ffff:74.125.136.27</div><div>Relay: <a \
href="http://alt3.gmail-smtp-in.l.google.com">alt3.gmail-smtp-in.l.google.com</a>, \
Priority: 30, Address: ::ffff:64.233.163.26</div><div>Relay: <a \
href="http://alt4.gmail-smtp-in.l.google.com">alt4.gmail-smtp-in.l.google.com</a>, \
Priority: 40, Address: \
::ffff:74.125.130.26</div><div><br></div><div>root@syscenter:/var/log# testmxlookup \
<a href="http://eldominio.net.ve">eldominio.net.ve</a></div><div>Domain <a \
href="http://eldominio.net.ve">eldominio.net.ve</a>:</div><div>Relay: <a \
href="http://mx.eldominio.net.ve">mx.eldominio.net.ve</a>, Priority: 10, Address: \
::ffff:192.168.0.56</div><div>root@syscenter:/var/log# \
</div></div><div><br></div>the command used to send was:<div><br></div><div>echo \
"Subject: tests" | /usr/sbin/sendmail <a \
href="mailto:mckaygerhard@gmail.com">mckaygerhard@gmail.com</a><br></div><div><br></div><div>i \
verify the host :</div><div><br></div><div><div>root@syscenter:/var/log# host <a \
href="http://eldominio.net.ve">eldominio.net.ve</a></div><div><a \
href="http://eldominio.net.ve">eldominio.net.ve</a> has address \
192.168.0.56</div><div><a href="http://eldominio.net.ve">eldominio.net.ve</a> mail is \
handled by 10 <a href="http://mx.eldominio.net.ve">mx.eldominio.net.ve</a>.</div><div> \
root@syscenter:/var/log#</div></div><div><br></div><div><div>root@syscenter:/var/log# \
host <a href="http://gmail.com">gmail.com</a></div><div><a \
href="http://gmail.com">gmail.com</a> has address 216.58.222.133</div><div><a \
href="http://gmail.com">gmail.com</a> has IPv6 address \
2800:3f0:4003:c01::12</div><div><a href="http://gmail.com">gmail.com</a> mail is \
handled by 10 <a href="http://alt1.gmail-smtp-in.l.google.com">alt1.gmail-smtp-in.l.google.com</a>.</div><div><a \
href="http://gmail.com">gmail.com</a> mail is handled by 20 <a \
href="http://alt2.gmail-smtp-in.l.google.com">alt2.gmail-smtp-in.l.google.com</a>.</div><div><a \
href="http://gmail.com">gmail.com</a> mail is handled by 30 <a \
href="http://alt3.gmail-smtp-in.l.google.com">alt3.gmail-smtp-in.l.google.com</a>.</div><div><a \
href="http://gmail.com">gmail.com</a> mail is handled by 40 <a \
href="http://alt4.gmail-smtp-in.l.google.com">alt4.gmail-smtp-in.l.google.com</a>.</div><div><a \
href="http://gmail.com">gmail.com</a> mail is handled by 5 <a \
href="http://gmail-smtp-in.l.google.com">gmail-smtp-in.l.google.com</a>.</div><div>root@syscenter:/var/log# \
</div><div><div class="gmail_signature"><font color="#888888">Lenz McKAY Gerardo \
(PICCORO)</font><div><font color="#888888"><a href="http://qgqlochekone.blogspot.com" \
target="_blank">http://qgqlochekone.blogspot.com</a></font></div></div></div> \
</div></div>
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