Concurrencyincoming
From Qmailtoaster
concurrencyincoming
Maximum simultaneous incoming SMTP connections. Qmail-Toaster default is 100.
The value contained in this file is used as the '-c' parameter to tcpserver for qmail-smtpd.
supervise runs tcpserver which runs qmail-smtpd according to the contents of /var/qmail/supervise/smtp/run, which puts all of this together. See corresponding man pages for further details.