Observed Signal · Sep 3, 2026 · Product Launch · Source: https://martechseries.com/feed/ · Impact: 3/5 · Sentiment: Positive
Email Deliverability Market: Validity Launches Heatwave Blocklist to Combat Synthetic Domain Warming
Validity, a provider of Enterprise AI solutions for digital marketers, has launched Validity Heatwave, a new email blocklist designed to identify unethical cold email practices and artificial domain warming. Heatwave analyzes millions of data points from the Validity Intelligence Network and has already listed over one million domains exhibiting synthetic engagement patterns. Deceptive domain warming services generate fake opens, clicks, and replies to build artificial sender reputation. The blocklist is integrated into Validity's DNS reputation zones, providing mailbox providers and ESPs with an additional signal to filter out domains with manufactured reputation. Heatwave is used or evaluated by partners including Comcast, Proofpoint, Spamhaus, and SURBL.
This product launch introduces a new blocklist targeting synthetic domain warming, which degrades email trust and deliverability. It provides a new signal for mailbox providers and ESPs to filter deceptive senders, potentially protecting legitimate senders and improving email ecosystem integrity.
Key Takeaways & Evidence Grounding
- Validity launched Heatwave, an email blocklist to combat artificial domain warming.
- Heatwave listed more than 1 million domains with unethical warming behaviors.
- The blocklist uses data from the Validity Intelligence Network.
- Heatwave is integrated into Validity's DNS reputation zones.
- Partners including Comcast, Proofpoint, Spamhaus, and SURBL use or evaluate Heatwave.
Connected Companies & Entities
3 Entities mappedbeehiiv
Newsletter software with built-in audience growth and monetisation.
“Synthetic domain warming is a direct violation of beehiiv’s Acceptable Use Policy....”
Proofpoint
Cloud email security and compliance software for enterprises.
“Heatwave is used or evaluated by existing global mailbox provider partners, message security partners, including Comcast, Proofpoint, Spamha...”
Comcast
Broadband, streaming and premium video advertising technology group.
“Heatwave is used or evaluated by existing global mailbox provider partners, message security partners, including Comcast, Proofpoint, Spamha...”
Ontology Mapping & Concepts
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