
Dmitri Alperovitch is a Russian-born American computer security industry executive. He is co-founder and former chief technology officer of CrowdStrike. In August 2011, as vice president of threat research at McAfee, he published Operation Shady RAT, a report on suspected Chinese intrusions into at least 72 organizations, including defense contractors, businesses worldwide, the United Nations and the International Olympic Committee. Alperovitch is a naturalized American citizen born in Russia who came to the United States in 1994 with his family.

Blue Frog was a freely-licensed anti-spam tool produced by Blue Security Inc. and operated as part of a community-based system which tried to persuade spammers to remove community members' addresses from their mailing lists by automating the complaint process for each user as spam is received. Blue Security maintained these addresses in a hashed form in a Do Not Intrude Registry, and spammers could use free tools to clean their lists. The tool was discontinued in 2006.

Roger Joseph Ebert was an American film critic, film historian, journalist, screenwriter, and author. He was a film critic for the Chicago Sun-Times from 1967 until his death in 2013. In 1975, Ebert became the first film critic to win the Pulitzer Prize for Criticism. Neil Steinberg of the Chicago Sun-Times said Ebert "was without question the nation's most prominent and influential film critic," Tom Van Riper of Forbes described him as "the most powerful pundit in America," and Kenneth Turan of the Los Angeles Times called him "the best-known film critic in America."

Callback verification, also known as callout verification or Sender Address Verification, is a technique used by SMTP software in order to validate e-mail addresses. The most common target of verification is the sender address from the message envelope. It is mostly used as an anti-spam measure.

A feedback loop (FBL), sometimes called a complaint feedback loop, is an inter-organizational form of feedback by which a mailbox provider (MP) forwards the complaints originating from their users to the sender's organizations. MPs can receive users' complaints by placing report spam buttons on their webmail pages, or in their email client, or via help desks. The message sender's organization, often an email service provider, has to come to an agreement with each MP from which they want to collect users' complaints.

Microsoft Exchange Hosted Services, also known as FrontBridge, is an email filtering system owned by Microsoft. It was acquired in 2005 from Frontbridge Inc. FrontBridge Technologies began in 2000 as Bigfish Communications in Marina del Rey, California. The service is sold directly and through partnership with Sprint Nextel.

Proofpoint, Inc. is an American enterprise security company based in Sunnyvale, California that provides software as a service and products for inbound email security, outbound data loss prevention, social media, mobile devices, digital risk, email encryption, electronic discovery ("eDiscovery"), and email archiving.

reCAPTCHA is a CAPTCHA system that enables web hosts to distinguish between human and automated access to websites. The original version asked users to decipher hard to read text or match images. Version 2 also asked users to decipher text or match images if the analysis of cookies and canvas rendering suggested the page was being downloaded automatically. Since version 3, reCAPTCHA will never interrupt users and is intended to run automatically when users load pages or click buttons. reCAPTCHA is owned by Google.

Sendio is a Newport Beach, California-based e-mail security company. The privately held company was founded in 2004 by Tal Golan, who currently serves as the company's president and CTO. By using Sender Address Verification technology, Sendio provides an e-mail security solution which stops spam, viruses, malware, phishing attacks and unsolicited e-mail from reaching the e-mail inbox. In February 2007, Sendio received $4 million in venture capital funding from Vicente Capital, Shepherd Ventures and Athenian Venture Partners. Former Microsoft CIO Rick Devenuti was appointed to the Board of Directors at Sendio in 2007.

Pavel Olegovich Vrublevsky is a Russian, owner and general manager of the processing company ChronoPay. He is also the founder of investment company RNP and a Russian Forbes contributor on matters relating to blockchain, cryptocurrencies, and cybersecurity. He was also implicated in a range of criminal cases related to hacking.