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These security features include DNS-based Blackhole List (DNSBL) and Realtime Blackhole List (RBL) support for popular services such as Spamhaus, Composite Blocking List (CBL), SpamCop and Sorbs. ThunderSec also introduces support for Spam URI Realtime Blackhole Lists (SURBL). Additionally, you can define custom DNSBL, RBL and SURBL services of your choosing.\n\nThunderSec also introduces client-side checks for DomainKeys Identified Mail (DKIM) and Sender Policy Framework (SPF) violations. \n\nWhitelists can be used to mark DNSBL, SURBL, DKIM and SPF violations as legitimate for improved efficacy and user experience.\n\nThe source code and issue tracker for this extension is hosted at GitHub at the following URL:\n\nhttps://github.com/itemir/thundersec\n\nThe add-on can be found on [Mozilla Add-ons page](https://addons.mozilla.org/en-US/thunderbird/addon/thundersec/) at the following URL:\n\nhttps://addons.mozilla.org/en-US/thunderbird/addon/thundersec/\n\n## Installation Instructions\n\nThunderSec installation instructions are available at the following URL:\n\nhttps://github.com/itemir/thundersec/wiki/ThunderSec-Installation-Instructions\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fitemir%2Fthundersec","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fitemir%2Fthundersec","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fitemir%2Fthundersec/lists"}