Are there plans to offer an list with the SURBL domain names resolved into IP addresses?
The quick answer is probably not. One of the benefits of SURBLs is the lack of need to do forward name resolution, where in large volume mail systems the associated lookups, timeouts, etc. can incur too large a delay to be practical. There are also some security or privacy concerns about resolving a keyed domain name, since that could give out information about the success of a unsolicited messages, for example if the recipient is keyed in the full domain name as in: http://resolving-this-confirms-specific-recipient.somedomain.com/ The concern here is that the act of performing the resolution itself could be used as a confirmation of a delivery attempt given a URI customized (keyed) to a specific recipient. Such a confirmation could be used to build additional recipient lists, even if it just helps narrow down messages (and therefore recipients) which made it through the gauntlet of other filtering methods. In other words name resolution can potentially provide useful information to th