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rbldnsd is widely used for public and private mirroring of RBL zone files. A common rule of thumb is that the overhead of doing rbldnsd and rsync become worthwhile for mail servers that process more than 100,000 messages per day. Some RBLs imposse a minimum daily message count for allowing rsync access. Some RBLs charge a subscription fee for access. Others don't. Please check with the RBL operators as appropriate.

If you have a good guide to the commands required to install this on a typical system, please edit this page and fill out this section.

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