A cybersecurity firm in King of Prussia, Pennsylvania. Performs offensive security testing (penetration testing, red teaming), incident response and digital forensics, security advisory and vCISO work, and resells security technology.

The company that just emailed you from getsevn-x.com. Sends outbound mail from domains kept separate from sevnx.com, so a big send never dents the delivery its clients and partners rely on. Ordinary practice, same company, different envelope.