Thunderbird Sieve Add-on
Updates of Thunderbird sometimes break add-ons and it might take a while until a new stable release of a broken add-on is available. If an intermediate version is available it will be provided here.
Pre-built Sieve Add-on
For Thunderbird 68.2.2+, download sieve@mozdev.org.xpi built from commit 67d7b1c.
How to build
git clone https://github.com/thsmi/sieve.git
cd sieve
npm install
./node_modules/.bin/gulp addon:package
zip -9 -r sieve@mozdev.org.xpi build/*