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<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Hi Alistair and
Gareth too.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>I have used nagios
for many years. However if you read my mail again, I specifically don’t need
to know the queue size or the status of the MTA, none of those can give you a
definitive answer about whether or not mail flow is working, I need something
that can check if mail is flowing and if its delayed.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><br>
/Jonas<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> mailscanner-bounces@lists.mailscanner.info
[mailto:mailscanner-bounces@lists.mailscanner.info] <b>On Behalf Of </b>Alistair
Carmichael<br>
<b>Sent:</b> 9. juli 2007 12:31<br>
<b>To:</b> MailScanner discussion<br>
<b>Subject:</b> RE: How to monitor the health of the MailScanner architecture<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Hi,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>The monitoring software I use - nagios is capable of this, without
going into too much detail its basically a monitoring tool that can run on a
webserver and then check the status of software such as your mta remotely
aswell as executing local scripts on each mailscanner server to check queue
sizes and report back to the nagios monitoring server via the nagios nrpe
plugin, which can be configured to alert via email or even sms once certain
thresholds (e.g queue size) are met. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>In our setup I wrote my own queue size monitor script but there are
nrpe scripts already created for various MTA’s out there.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Al<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
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style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> mailscanner-bounces@lists.mailscanner.info
[mailto:mailscanner-bounces@lists.mailscanner.info] <b>On Behalf Of </b>Jonas
A. Larsen<br>
<b>Sent:</b> 09 July 2007 11:04<br>
<b>To:</b> mailscanner@lists.mailscanner.info<br>
<b>Subject:</b> How to monitor the health of the MailScanner architecture</span><span
lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Hello all<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I have a problem, and discussing it on the
irc channel didn’t turn up any obvious solution.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Say you have more than 1 MS box scanning
mails for a specific domain. They are load balanced in some way, so the load is
split over the servers.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Now lets say one of the servers have a
problem. Not a fatal problem, so the server is still running (responds to pings
etc) port 25 is still open, and exim (the mta in my case) still accepts mails.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>But for some reason, crash, corrupt config,
full root fs etc. the process of moving mails from the incoming queue to the
outgoing queue is not working.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>What I am interested in, is a system to
alert me of such a problem automatically.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Currently the only thing, besides clients
noticing mail being delayed, is for me to look at my mailscaner-mrtg graphs for
the incoming queue and notice that its growing.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>One method of doing all this automatically
that we came up with, would be some complex system that would work as follows:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>You create a domain for each MailScanner,
that only that MailScanner scans for.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>You then create an imap account on another
system for each of the domains.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>You then create a script that sends a mail
to each of the accounts and after X amount of minutes check to see if the mail
has arrived on the imap account. If yes, delete the mail and do the same thing
again after Y amount of minutes (a cron job), if it doesn’t exist
something must be wrong with the mailflow, either its interrupted or is
experiencing delays.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Do anybody have a better idea or know of
something that can do this already?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>My root file system ran full last week, and
it caused mails to still be accepted (incoming is on /var on another disk) but
MS was frozen because it couldn’t extract attachments to /tmp which was
full because it was on the same disk as the root fs.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I hope I have made the above somewhat
clear, if not please ask me to clarify.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><b><span lang=EN-GB style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Med venlig hilsen / Best regards</span></b><span
lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><b><span lang=EN-GB style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Jonas Akrouh Larsen<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span lang=EN-GB style='font-size:12.0pt;font-family:
"Times New Roman","serif"'><o:p> </o:p></span></b></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>TechBiz
ApS<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Laplandsgade
4, 2. sal</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>2300 København
S</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Office:
7020 0979<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Direct:
33369974</span><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Fax:
7020 0978<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Mobile:
51201096</span><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Web:
</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><a
href="http://www.techbiz.dk/" title="http://www.techbiz.dk/"><span lang=EN-US>www.techbiz.dk</span></a></span><span
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br>
This email and any files transmitted with it are confidential and intended
solely for the use of the individual or entity to whom they are addressed. If you
have received this email in error please notify the system manager. This
message contains confidential information and is intended only for the
individual named. If you are not the named addressee you should not
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<p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br>
This email and any files transmitted with it are confidential and intended
solely for the use of the individual or entity to whom they are addressed. If
you have received this email in error please notify the system manager. This
message contains confidential information and is intended only for the
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