> for busy servers as MX, 20 is low. Listen pipes listen for connections from SMTPD to QM (or Declude/mxGuard to QM), not connections from Internet to SMTPD. I suspect you're thinking otherwise. The socket bottleneck at SMTPD makes increasing listen pipes beyond 64 useless. Delivery threads are QM threads (SMTP clients in your comparison).
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