Cockroach Central is undergoing renovation. Your visit has been noted and will be subject to investigation.
You may be looking for these resources:
The archive of old JS-Kit comments from The Smallest Minority
The Procmail Email Sanitizer home page
The Linux VPN Masquerade home page
Electronic books and paper books by Lois McMaster Bujold
tarpit.impsec.org - The impsec.org domain SMTP tarpit policy - if your MTA is wedged with dozens of processes trying to send spam to impsec.org email addresses, then take all impsec.org email addresses off of your spam mailing lists, or clean up your open relay. It's that simple.
Also, referrer spammers (people who visit this website just to advertise their website URL into the webserver logs) may be tarpitted if they become too aggressive, and PHP scanners will be automatically tarpitted.
Behave and you won't get stuck.