Commonly used SpamAssassin RBL (Real-time Blacklist)

 Here are some specific RBL (Real-time Blacklist) checks commonly used in SpamAssassin:

1. use_razor2: Enables the Razor2 collaborative filtering network, which detects spam by comparing checksums of email messages with known spam signatures.
2. use_dcc: Activates the Distributed Checksum Clearinghouse (DCC) system, which uses checksums of mail messages to identify spam. DCC relies on a network of participating servers to collect and analyze checksum data.
3. use_pyzor: Enables Pyzor, a collaborative spam detection system that uses checksums of email messages to identify spam. Pyzor operates by comparing the checksums of incoming messages with a database of known spam signatures.
4. use_ahbl: Activates the Abuse Hub Block List (AHBL), which is a DNS-based blacklist that identifies and blocks email from known sources of abuse. Note that AHBL is no longer actively maintained.
5. use_barracuda: Enables the Barracuda Reputation Block List (BRBL), which is a DNS-based blacklist that contains IP addresses associated with spamming activity.
6. use_sorbs: Activates the Spam and Open-Relay Blocking System (SORBS), a DNS-based blacklist that identifies spam sources, open relays, and other types of email abuse.
7. use_spamhaus: Enables the Spamhaus DNSBL (Domain Name System Block List), a widely used DNS-based blacklist that includes several sub-lists such as SBL, XBL, and PBL.
8. use_uribl: Activates the URIBL (Uniform Resource Identifier Blacklist), which checks the reputation of URLs found within the email message content. URIBL can help identify spam that includes links to known spam or malicious websites.

Please note that the availability and usage of these RBL checks may vary depending on the specific SpamAssassin configuration and the RBL databases you choose to utilize.