qmail speed improvement

[Michael Maier]

Hi, I'm running qmail on Solaris 7 (SUN Netra T1) and I am trying to
send out 500.000 e-Mails for Testing.
I setup a Remote Concurrency of 400 and have queue Directory Split + Big
Todo Server Patches.
Why are there just average of 4 concurrent qmail-remote Processes ?
How to improve it ?
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Thanks,
 Michael