Original sentence: Spamhaus is responsible for two widely-used DNSBLs in the anti-spam business -- the Spamhaus Block List and Exploits Block List.The SBL and XBL collectively serve over 260 million e-mail users, according to Spamhaus' web page
Edited sentence: Spamhaus is responsible for two of the most widely-used DNSBLs in the anti-spam business -- the Spamhaus Block List and Exploits Block List.The SBL and XBL collectively serve over 260 million e-mail users