OK, we've whitelisted a snapshot of the large ISPs from the senderbase.org top domains list. Some notes:
1. This is a snapshot of the list of the top senders of mail as determined by sendebase.org's techniques.
2. We have excluded a few obvious spammers and included only large ISPs and NSPs.
3. Whitelisting these ISP domains does not mean their customers, name servers, IP blocks or anything other than the ISPs' own domain names will be excluded from SURBLs.
4. None of these domains appeared on any SURBLs before whitelisting.
5. The sorted list can be found at:
http://spamcheck.freeapp.net/whitelists/senderbase-isps.sort
Please let me know if you have any questions or comments.
Jeff C.