Addresses, related to spam and complaints, that accept e-mail from anyone:
 
Places to send spam complaints (in addition to abuse address at ISP, and newsgroup news.admin.net-abuse.sightings) and bounces thereof: Addresses to include in your test message to accept-then-bounce systems such as .vacation and challenge/response and broken mail systems etc., to collect evidence that non-delivery notices etc. are splattered out to whatever address was forged in these various parts of SMTProtocol and/or RFC822 header: Forward your raw spam directly here, such as via procmail recipes. If you know the ISP, and it's listed here, use that group. Otherwise, if you can sort by first byte of IP number of SMTP client, and it's included here, use that group. Otherwise, use one of the generic catch-all groups.
Other Yanoo! Groups relevant to fighting spam: