XSender (XSNDR) provides rentable XMPP spam slots for anyone looking to peddle legal or illegal products. The service’s creators, a group of hackers known as Overload, say they don’t rob a banks and don’t write malware. 99% of their clients work in cyber-crime, the XSNDR crew says. The group’s website, available on the unindexed Deep Web, is extremely minimal, with just two sections, one describing the service and one listing the prices.
Source: https://www.bleepingcomputer.com/news/security/xsender-the-source-of-all-the-recent-xmpp-spam/