This project packs the leaked email database into a bloom filter for safe, private offline address testing. The filter is 4MB uncompressed and contains no actual e-mail addresses. It has a false positive rate of less than 4%. It can be found here:
The C program on the master branch generates the bloom filter. I don't want to link to it, so you'll have to find the leak database online yourself. The gh-pages branch contains a webapp that queries the bloom filter in browser memory.