Brandon Hilkert wrote:

I also put the queue directory back on an ext3 partition and the rates went up by about a factor of two.

Also, by default the syslog messages were already set with " -/var/log/mail.log". I disabled mail logging all together and found no change in rates.

My disk is writing about 3 MB/s which should be well within it's range. I would hope even larger, but I would like to work out the ramfs and test for sure.

If your test destination is a single server delivering the mail {anywhere}, that's a good candidate for a bottleneck.

For testing, you should set up postfix smtp-sink test program included with the postfix source. The program isn't installed by default, but can be found in the src/smtpstone directory of the postfix source tree.
http://www.postfix.org/smtp-sink.1.html
Run the smtp-sink program on the test destination server, listening on port 25. Don't run postfix or another mail program on that server.

  -- Noel Jones

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