Hosts listed in the level3.txt file have delivered at least 10 spams to our spamtraps in the last 24 hours, but are not whitelisted in the DNS Whitelist.
Hosts listed in the level4.txt file have delivered at least 10 spams to our spamtraps in at least one twenty four hour period in the last 7 days, but are not whitelisted in the DNS Whitelist.
For more detail on how the zones are generated please see the "How the listings are compiled" information page.
Listed? "Watch me not care", this is an automated blocklist, removals happen automatically when the network stops spamming, or when ASPEWS lists the network. The spamtraps are prefiltered against SORBS and ASPEWS.
To use the list, choose the blocking level, and use it like any ordinary RBL. A good explanation of this is here and here. If you wish to use the list for any other purposes than blocking email at the SMTP level, you're on your own. SORBS has kindly offered to provide the DNS infrastructure for direct RBL queries, this can be configured as l3.bbfh.ext.sorbs.net (Level 3 listings) and l4.bbfh.ext.sorbs.net (Level 4 listings).
The Level 3 zone contains all the networks in the Level 1 zone, you do not need to query both. Also the Level 4 zone contains all the networks in the Level 1, Level 2 and Level 3 zones so please do not query them all separately.