The VISI.com RSL is a DNS-based list of mail servers that have relayed third-party spam within the recent past. If you run a mail server, you can use this list to refuse mail from those servers. People often block mail from these "open relay" mail servers on the premise that where some spam has traveled, more is likely to follow.
The vast majority of RSL data is compiled on an automated basis, primarily through the use of spamtrap addresses. This data is gathered for the purpose of benefitting VISI.com customers in their spam filtering and blocking efforts, but is offered free of charge to the greater Internet community, for as long as we have the resources to spare.
Frequenty asked questions (FAQ) about RSL.
Look up information on a current, pending, or past RSL listing.
Request that a server be removed from this list
Updated 07/29/03 by rsl@visi.com
