Performance numbers for a DELL R710

Kevin Miller Kevin_Miller at
Mon Jun 8 23:42:05 IST 2009

Doing any graylisting, greet-pause, or recipient address verification?  Stopping invalid messages at the MTA handshake level takes a lot of the load off MailScanner...

Kevin Miller                Registered Linux User No: 307357
CBJ MIS Dept.               Network Systems Admin., Mail Admin.
155 South Seward Street     ph: (907) 586-0242
Juneau, Alaska 99801        fax: (907 586-4500

From: mailscanner-bounces at [mailto:mailscanner-bounces at] On Behalf Of Zaeem Arshad
Sent: Tuesday, June 02, 2009 7:42 PM
To: MailScanner discussion
Subject: Re: Performance numbers for a DELL R710

On Wed, Jun 3, 2009 at 12:47 AM, Martin Hepworth <maxsec at<mailto:maxsec at>> wrote:


depends on the tests you run (RBLs etc) and the size of the emails.

look in the wiki for performance and tuning on both MailScanner and

I have a test box with the same specs but 8 Gigs of RAM. My performance tuning so far has been

- tmpfs for message scanning
- DNS caching server on the same box
- Lower timeouts on Postfix (another instance handling retries)
- Compiled rules on SA
- DCC, Razor
- Clamd
- Asyncrhonous logging

Filesystem underneath is XFS and average mailsize is around 60KB. I have pretty much made all the changes suggested and currently the server is handling around 45000 emails/hour. Do you think increasing the number of MailScanner children might help? What other performance tweaks can I have? I am looking to scale the system to handle at least 65 emails/second with antivirus, antispam scanning and RBL checks.


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