mail/smtp-delay 0.20 NetBSD

This little number can be used to introduce smtp banner delays for qmail. When run between tcpserver and rblsmtpd, it'll do a reverse lookup of the connecting IP, compare that PTR to a regex, and then apply long banner delays if there was no PTR or if the PTR matches the "dialup" regex. The program depends on the fact that tcpserver will set TCPREMOTEIP, and will take advantage of TCPREMOTEHOST if it's set. If the client tries to pipeline (ram SMTP commands down our throat before we show them an SMTP banner), RBLSMTPD is set, notifying rblsmtpd to refuse their mail.