Mike,
I've found a few of them out there, but they seem to be priced as if I'm a hosting company or an ESP, not an end-user-focused ISP.
There are only two IP-based reputation services that are truly widely used, world-wide, ours and Validity's (nee ReturnPath). Our have *always* been free for receivers to query, and always will be, as our primary reason for having been in business for going on 20 years is to provide a way for *receivers* to determine the ham from the spam (making it easier for them to reject spam). I'm surprised to hear that *any* of the others are charging for access for querying - shocked in fact. You can always query our IADB (ISIPP Accreditation Database, now known to consumers as the Good Senders List, or GSL) here: iadb.isipp.com More general information about the IADB is here: https://www.isipp.com/for-isps/ You can read more about our granular query responses, which we call Data Response Codes (we were the first to develop this method of responding to IP-based queries, nearly 20 years ago): https://www.isipp.com/for-isps/about-the-codes/ If you have any questions, any at all, please feel free to reach out to me directly. Kind regards, Anne --- Anne P. Mitchell, Esq. CEO Get to the Inbox by SuretyMail Author: Section 6 of the CAN-SPAM Act of 2003 (the Federal email marketing law) Author: The Email Deliverability Handbook Board of Directors, Denver Internet Exchange Dean Emeritus, Cyberlaw & Cybersecurity, Lincoln Law School Prof. Emeritus, Lincoln Law School Chair Emeritus, Asilomar Microcomputer Workshop Counsel Emeritus, MAPS: Mail Abuse Prevention System (now the anti-spam division of TrendMicro)