iXhash2 is an unofficial improved version of the iXhash spam filter plugin for SpamAssassin, adding async DNS lookups for performance and removing unneeded features but fully compatible with the iXhash 1.5.5 (https://sourceforge.net/projects/ixhash/) implementation. It computes MD5 checksums of fragments of the body of an e-mail and compares them to those of known spam using DNS queries to a RBL-like name server. So it works similar to the standard plugins that use the Pyzor, Razor and DCC software packages from within SpamAssassin.