thundersec
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ThunderSec is a security plugin for Mozilla Thunderbird that creates several pieces of additional security functionality, including DNSBL, RBL, SURBL, DKIM and SPF.
ThunderSec for Mozilla Thunderbird
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ThunderSec also introduces client-side checks for DomainKeys Identified Mail (DKIM) and Sender Policy Framework (SPF) violations.
Whitelists can be used to mark DNSBL, SURBL, DKIM and SPF violations as legitimate for improved efficacy and user experience.
The source code and issue tracker for this extension is hosted at GitHub at the following URL:
https://github.com/itemir/thundersec
The add-on can be found on Mozilla Add-ons page at the following URL:
https://addons.mozilla.org/en-US/thunderbird/addon/thundersec/
Installation Instructions
ThunderSec installation instructions are available at the following URL:
https://github.com/itemir/thundersec/wiki/ThunderSec-Installation-Instructions