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		Spamhaus DNSBL Datafeed Service DNSBL service for professional users Datafeed Query Service and Datafeed Rsync Service are dedicated services designed for users with professional DNSBL query requirements, such as corporate networks and ISPs. Mail server operators can now choose between either querying a dedicated set of Spamhaus DNSBL servers in realtime or synchronizing the Spamhaus DNSBLs every 15 minutes with a local DNS server on their networks. Both services come with Service Agreement contracts and Technical Support.
		Datafeed Query Service For small and medium networks Datafeed Rsync Service For medium and large networks Query Service provides dedicated realtime access to all Spamhaus DNSBLs from a private dedicated network of Spamhaus DNSBL servers and uses traditional DNS queries so mail server configuration is simple and straight forward. Mail system administrators already familiar with using public Spamhaus DNSBLs can switch to using the Datafeed Query Service in minutes, with no software to install. Unlike Spamhaus's free but very high traffic public query service which operates on donated resources and can not be used by commercial or heavy users, the Datafeed Query Service utilizes high-speed servers maintained by Spamhaus's engineering group which guarantees the availability of the service even to very heavy users. Fast easy setup Fast priority DNSBL access Rsync Service provides synchronization of the Spamhaus Blocklists (SBL, XBL, PBL and DROP) to your DNS server on your network every 30 minutes. (To use this service you need to be operating your own DNS server) This method eliminates external network latency problems and significantly speeds up email filtering on large mail systems. For large networks Rsync service has strong advantages over the traditional DNS query scheme: 1) it is still based on DNS queries, so there is little difference (if any) in your mail servers configuration; 2) all DNS queries are local on your network, so the turnaround time is short and entirely under your control; this means shorter transit times for messages. This service utilizes Rsync as the data synchronization method and Rbldnsd to serve the DNSBL zones locally. Rbldnsd is a free DNS server (available for UNIX and Windows) specifically designed for fast loading and serving of large DNSBLs. Faster local access to data Local control over DNSBL data
Tell me How can I try this service first? Datafeed FAQ		Service Pricing The Datafeed service is supplied as a yearly subscription, with a Service Level Agreement and Technical Support. Pricing is based on the total number of Email Users your organization provides email service for, and the type of organization (commercial or non-profit). You can also try the service free for 30 days before agreeing to purchase it. To check the price for your organization, or to apply for a Datafeed, see:

		Datafeed is a dedicated data service sold and supplied by Authorized Datafeed Vendors, independent contractors authorized by The Spamhaus Project to provide access by subscription to Spamhaus DNSBL data. You only need the Datafeed service if you are a heavy user, corporate, ISP or commercial network. If you are a small network with low email traffic you probably do not need this service. See Spamhaus DNSBL usage for eligibility information.