Wietse Venema put forth on 12/1/2009 1:20 PM: > If your performance is inadequate, I suggest that you do a detailed > system performance analysis to find out if the limit is CPU, memory, > file I/O or perhaps some trivial DNS configuration problem.
That may be difficult for the OP to provide. From all I've read, his perceived performance degradation is being generated by a synthetic load test application, SPECmail 2009, in a _lab_ environment, so DNS isn't even in the testing. SPECmail 2009 is designed to test internal corporate mail loads, not internet mail loads. Given the 1 million mailboxes, the OP needs to contact Suresh for some pointers on architecting and managing large scale internet mail: http://www.hserus.net/wiki/index.php/Main_Page http://www.outblaze.com/index.php/corporate/ -- Stan
