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<p class="MsoNormal">We filter for a few smaller post-secondary’s as well as a
few dozen K-12 districts.<span style=""> </span>We have two gateway
machines running MS/Postfix on Sun coolthreads hardware.</p>
<p class="MsoNormal"><br></p><p class="MsoNormal">Two separate DNS servers run RBLDNSd/Bind and serve a local
mirror of the Spamhaus Zen feed (for which we have a subscription and rsync
with them), the Barracuda RBL as well as a locally generated RBL.<span style=""> </span>We also use SQLGrey, though I’m no longer
convinced it adds terribly much value these days.</p>
<p class="MsoNormal"><br></p><p class="MsoNormal">Another machine does MySQL for Mailwatch logging and fancy
reporting with pretty graphs.</p>
<p class="MsoNormal"><br></p><p class="MsoNormal">We reject 85-95% of all incoming connections at the MTA
level and pass the rest to MS.<span style=""> </span>We use
Clamd with the addition of Sanesecurity and ScamNailer sigs.</p>
<p class="MsoNormal"><br></p><p class="MsoNormal">We wrote in –house a parser for the MTA logs to have them
inserted into the MailWatch DB in order to get daily message counts, which get munged
into a daily summary table for all of our customer domains.<span style=""> </span>We then purge the MTA junk out of the DB to
save on space.</p>
<p class="MsoNormal"><br></p><p class="MsoNormal">Load-balancing is done via DNS round-robin.<span style=""> </span>A proper load balancer is on my list for
Santa this year.<span style=""> </span>I emailed it, so I hope
it doesn’t get caught in a quarantine or collide with some queue file of the
same name somewhere along the way.</p>
<p class="MsoNormal">We see between 2 and 7 million connections hit our gateways
per day, with 80,000 to 100,000 being delivered to user mailboxes or downstream
customer servers as “clean” daily.</p>
<p class="MsoNormal">/jared</p>
<p class="MsoNormal"> </p>
<br><br><div class="gmail_quote">On Fri, Dec 11, 2009 at 12:35 PM, Gottschalk, David <span dir="ltr"><<a href="mailto:dgottsc@emory.edu">dgottsc@emory.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I'm posing a question to those of you who work for a University or College.<br>
<br>
Here at Emory, we have a hosted email filtering called Postini (which is now owned by Google). Behind that, we have six MailScanner machines that relay mail to the appropriate internal mail system. After the economic turndown, we have been looking anywhere to save costs. I'm contemplating proposing that we dump our hosted filtering solution because it is quite expensive ($5+ per user per year), and rely on MailScanner instead entirely. Then we would just have a bunch of MailScanner machines fronted by a load balancer to handle all inbound email (I'd imagine we need more than six after doing so)<br>
<br>
I'm wondering though how other colleges are handling their mail filtering using MailScanner. How many machines are being used, etc, etc?<br>
<br>
We currently get about 30-40 million email messages per week, of which about 1.5 million are delivered to our relays. We have approximately 40,000 email accounts.<br>
<br>
Thanks for any assistance, advice.<br>
<br>
David Gottschalk<br>
Emory University<br>
UTS Messaging Team<br>
<br>
<br>
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