University MailScanner Setup

Robert Lopez rlopezcnm at
Fri Dec 11 20:43:26 GMT 2009

On Fri, Dec 11, 2009 at 11:35 AM, Gottschalk, David <dgottsc at> wrote:
> I'm posing a question to those of you who work for a University or College.
> 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)
> I'm wondering though how other colleges are handling their mail filtering using MailScanner. How many machines are being used, etc, etc?
> 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.
> Thanks for any assistance, advice.
> David Gottschalk
> Emory University
> UTS Messaging Team
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At Central New Mexico Community College, we run three load balanced
Postfix+MailScanner gateways that pass email to either a student email
system, a faculty/staff system, or to a mailman list server. As of
this week, we have 130,647 email accounts of which 54,405 are
currently enrolled students+college staff.

Based on the last six weeks:
We accept and deliver about 0.5 million email per week.
The Postfix+RBL reject about 2.25 million email that were never queued
to MailScanner.
MailScanner+Spamassassin identify 130k/week accepted email as spam.
MailScanner+ClamAV find over 300 virus/week.
MailScanner+ finds over 35,000 phishing email/week.

Robert Lopez
Unix Systems Administrator
Central New Mexico Community College (CNM)
525 Buena Vista SE
Albuquerque, New Mexico 87106

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