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How can I disable qmail from conducting reverse DNS lookups on SMTP connections?
This can be done by adding a "-H" flag to the tcpserver call within the qmail-smtpd supervise script. That file is located at /var/qmail/supervise/qmail-smtpd/run and you would do the following:
Find the line that starts with the tcpserver call:
/usr/local/bin/tcpserver -v -R -l "$LOCAL" -x /etc/tcp.smtp.cdb -c "$MAXSMTPD" \
and add the "-H" flag:
/usr/local/bin/tcpserver -v -R -H -l "$LOCAL" -x /etc/tcp.smtp.cdb -c "$MAXSMTPD" \