Mark Bucciarelli writes:
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 scarcityCorrect?
That's plausible. If some DNS server is not responding, it can take several minutes for the DNS query to time out. All the while, the incoming slot is taken up.
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