I guess my last question didn't make much sense, as I did not get any 
reply.  I'll try again, rephrasing it ...

Given:

 - a valid user

 - using the same email client

 - a stable network connection between client and server  

 - the Courier software is behaving as expected

Then:

 - scarcity of tcp connection slots is the only reason why the mail 
   client could not be able to connect to the tcp daemon running esmtdp?

 - turning off dnslookups speeds the esmtpd logic making it less likely   
   to hit this scarcity

Correct?

By scarcity, I include the calculations the tcp deamon does re: IP, 
class C network, and number of processes.

Last question: can Courier be configured to log a message when the tcp
connection slots are filled and it has to reject a connection?

Thanks,

m



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