[CentOS] Re: How to size an email server to handle 5 million emails per day

[Christopher Chan]

Bill Campbell wrote:
> On Thu, Jan 03, 2008, Joshua Gimer wrote:
>> I can only talk from experience; we are currently doing spam and anti- 
>> virus checks in our inbound flow of around 600,000 messages per day.  
>> To do this we have three inbound SMTP gateways running Sophos  
>> Puremessage with Sendmail as the MTA.. These systems are quad proc  
>> systems with 6 to 8 GB of ram. This is still not enough to handle the  
>> inbound flow efficiently at our organization.
> 
> We have a system that handles similar quantities of incoming mail with a
> single incoming MX server running postfix, amavisd, and clamav to do anti-
> virus checking only, passing clean messages to a cluster of five machines
> which do spamassassin checking and delivery into Maildir folders NFS
> mounted on a central machine using LDAP authentication on the cluster
> machines.

I wonder if you have tried postfix + clamav via clamav-milter in any 
testing for potential system upgrades?