Validity Launches Heatwave Blocklist
Validity, recognized as a leader in Enterprise AI solutions designed for digital marketers, has announced the launch of Validity Heatwave. This groundbreaking email blocklist aims to combat unethical cold email practices, particularly those involving artificial domain warming.
The Heatwave blocklist leverages insights from millions of data points sourced from the Validity Intelligence Network. Within a short timeframe since its launch, Heatwave has flagged over a million domains employing dubious strategies associated with unethical email warming. To check the current status of domains, users can visit
lookup.validity.tools.
Understanding Domain Warming and Its Impact
In recent years, deceptive domain warming tactics have become increasingly prevalent. These tactics are utilized to fabricate and maintain a façade of legitimacy for cold email campaigns, thereby enabling bulk outreach efforts. The process typically involves the registration of dummy domains that closely resemble a customer’s actual domains. These domains generate artificial emails, opens, clicks, and replies through a network of fake accounts, misleading mailbox providers like Gmail and Outlook about the sender's authenticity.
Tom Bartel, Senior Vice President of Data at Validity, emphasized the importance of genuine email interactions: “Email works because people trust it, and that trust hinges on the integrity of the signals behind the inbox.” He further noted that when sender reputation is artificially constructed rather than genuinely earned, it undermines the entire ecosystem. Trustworthy email senders find themselves at a disadvantage, while mailbox providers are forced to become stricter with their filtering processes.
A Game Changer for Mailbox Providers and ESPs
One of the standout features of the Heatwave blocklist is its utility for Email Service Providers (ESPs) and mailbox providers. It helps these entities distinguish between senders who have cultivated their reputations legitimately and those who have resorted to synthetic methods. For ESPs, this means identifying clients who are leveraging artificial tactics for reputation building instead of developing legitimate mailing lists.
Alex Brotman, Senior Engineer at Comcast, commented on the importance of ethical sender behavior: “This particular signal is interesting because reputation relies on senders intentionally behaving ethically and doing the right thing. Nobody likes shortcuts, and nobody likes deception.”
Moreover, Carel Bitter, CEO at Spamhaus, affirmed that valid signal data is crucial for identifying and addressing patterns of domain manipulation. By working closely with Validity on Heatwave, Spamhaus can gain additional insights into the infrastructure behind these deceptive practices.
Enhancing Visibility Through Heatwave
Heatwave also provides an important tool for companies unaware of their involvement in unethical email warming practices. Many of these campaigns are executed through third-party vendors or subcontracted organizations. As a result, legitimate brands may find that warming activities are taking place under their names without their knowledge. By querying their primary domains at
lookup.validity.tools, brands can uncover related domains linked to synthetic warming activities, enhancing their awareness of the digital landscape they operate within.
Commitment to Email Integrity
The introduction of the Heatwave blocklist is not just a standalone effort but part of Validity's broader commitment to fostering trust within the email ecosystem. The company actively participates in various industry standards bodies and anti-abuse initiatives, collaborating with mailbox providers and email stakeholders to ensure email reputation and deliverability remains robust.
Mark Briggs, the Founder and CEO of Validity, stated, “For more than 25 years, Validity has been committed to being a force for good in email. Heatwave is that commitment in action, using both our extensive data network and industry partnerships to create a safer, more trusted email environment.”
The current Heatwave blocklist is accessible at
lookup.validity.tools. ESPs, message security partners, and mailbox providers interested in full access are encouraged to get in touch with Validity directly.
About Validity
Validity has been at the forefront of email marketing solutions for nearly 30 years, establishing standards and practices that shape the industry. Their enterprise platform, Engage, empowers marketers to optimize their strategies based on actionable insights drawn from an extensive data network that processes billions of behavioral data points daily. For more information, visit
validity.com or connect with Validity on LinkedIn.