Easy implementation with easy reporting system for all types threats including reputation management or spam filtering using DNSBL lists/blacklists like Spamhaus Block List (SPB), Cloudmark BlackList(CPBWL)etc., DKIM validation process, Domain ownership verification against WHOIS database alongwith their IP address range restriction list; very good integration option available between SPF &DKIME protocols which can be used together if you are looking out from those things only! Overall best service provider i have come across so far who has proven itself time after again by delivering what they say it will deliver. If your business domain falls under these categories then this product should not go wrong at any cost because its really worth every penny that we pay into them!!