AT&T vs Proofpoint

AT&T Inc. is an American multinational telecommunications corporation, headquartered at Whitacre Tower in downtown Dallas, Texas. AT&T Inc. began its existence as Southwestern Bell Corporation, one of seven Regional Bell Operating Companies created in 1983 in the divestiture of the American Telephone and Telegraph Company following the 1982 United States v. AT&T antitrust lawsuit. Southwestern Bell changed its name to SBC Communications Inc. in 1995. In 2005, SBC purchased former parent AT&T Corp. and took on its branding, with the merged entity naming itself AT&T Inc. and using the iconic AT&T Corp. logo and stock-trading symbol.

Proofpoint, Inc. is based in Sunnyvale, California and provides SaaS and on-premises solutions for inbound email security, outbound data loss prevention, privacy protection, email encryption, electronic discovery and email archiving. Proofpoint delivers an integrated suite of on-demand data protection solutions spanning threat management, regulatory compliance, data governance and secure communicationsall of which are based on a common security-as-a-service platform.