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Vote for XWall for Microsoft Exchange
Works with: Every version of Exchange server including Exchange 2000/2003/2007, SBS 2000/2003 and Exchange 5.5; Any SMTP server like IMail, Lotus Notes and Novell GroupWise; Junk-E-Mail Folder of Exchange 2003/2007 using XWALLFilter event sink Dial-up, dial-up routers, ADSL and leased-line connections to the Internet; Spam Detection using: Multi Real-time Blackhole List - RBL / SLS / SPAM database; Greylisting spam filter; SURBL - Spam URI Real-time Blocklists - www.surbl.org; Bayesian pattern filter; SPF - Sender Permitted From - Sender Policy Framework; Sender ID Central Checksum Service (CCS) bulk e-mail detection; Heuristic spam filter; Phishing filter; Image spam filter and much more!