EmailReg.org provides a whitelist of legitimate email servers with their domains to reduce the chance of false positives while spam filtering. We provide a list of registered domains and IP addresses that are authorized to send email for those domains. This list is the Registered Email Sender List (RESL.) The RESL data is provided as a free RBL for all to use. There is a small administrative charge of $20 (annually per domain) to put your domain on the list and have it verified. This list is used by many people to bypass their spam filters.