Our company uses a well-known email broadcast company. We are on a mail server shared by many customers which is frequently blacklisted by SpamCop due to spamming activity by some of these other customers. I track the blacklistings with mxtoobox.com We're talking to the email broadcast company about putting us on one of their servers with better-behaved customers, or giving us our own IP address, which they want to charge a lot for. I'd like to get input on the impact of a mail server being blacklisted by SpamCop. I know that SoamCop is a significant blacklist owned by IronPort/Cisco that's used by a lot of ISP's, security appliances, and antispyware programs that do spam filtering. Any ideas on the percentage on emails that get blocked when a SpamCop blacklisting is active? Thanks.