Open Proxy Senders

A dynamic list of IP addresses of identity-masking relays, including proxy servers with open or insecure ports, provided by Symantec based on data from the Probe Network. Because open proxy servers allow spammers to conceal their identities and off-load the cost of emailing to other parties, spammers will continually misuse a vulnerable server until it is brought offline or secured. Part of the Sender Reputation Service, Open Proxy Senders is a sender group within Symantec Mail Security 8200 Series appliances.