You register with public jabber servers and send thousands of messages to crawled and constructed destination addresses: https://yaxim.org/blog/2017/12/22/spam

You register with public jabber servers and send thousands of messages to crawled and constructed destination addresses: https://yaxim.org/blog/2017/12/22/spam-reduction-on-yax-dot-im/ https://yaxim.org/blog/2017/12/22/spam-reduction-on-yax-dot-... https://www.bleepingcomputer.com/news/security/xsender-the-source-of-all-the-recent-xmpp-spam/ https://www.bleepingcomputer.com/news/security/xsender-the-s... https://github.com/ge0rg/jabber-spam-fighting-manifesto https://github.com/ge0rg/jabber-spam-fighting-manifesto