September 2026 Summaries

Validity’s Heatwave is a blocklist designed to identify domains that appear to use synthetic email-warming services, scoring them through signals from its Intelligence Network and sharing the results with mailbox providers and security vendors such as Comcast, Proofpoint, Spamhaus, and SURBL. More than 1.2 million domains have reportedly been listed, and inclusion can harm sending reputation and inbox placement; the synthetic-warming designation is permanent once a domain reaches the threshold, although a separate cold-outreach classification may be removed when that activity stops. Organizations may be affected by warming performed by agencies, outbound vendors, or lookalike domains registered on their behalf, and can check their status through Validity’s lookup tool or request a review if they believe a listing is incorrect. The recommended alternative is to build reputation organically by authenticating domains, obtaining recipient consent, increasing sending volume gradually, and generating genuine engagement rather than relying on automated activity.

Resend has announced the addition of Allie Sperry to its team to help support its expanding customer base, drawing on her experience in technical support, email development, and deliverability consulting at Litmus and Customer.io. Sperry’s interest in technology began with early experimentation on a salvaged iMac, Myspace layouts, and self-taught coding, later leading her from website and email side projects into the email industry. She was attracted to Resend after building an email-sending app and connecting with the company’s product, public content, and values, seeing the role as a convergence of her interests in building software and helping developers navigate email at scale. She finds inspiration in people, travel, conferences, and creative work, relies on Obsidian and physical notebooks for notes, enjoys Japan as a travel destination, and encourages aspiring software engineers to remain curious, pursue learning deliberately, and value their individual perspectives.

Resend has hired Gaby Garcia as a full-cycle recruiter to support its growth through people-focused hiring, strategic sourcing, strong partnerships, and scalable recruiting processes. Garcia, who studied psychology and transitioned into recruiting after working in social psychology, spent the previous five years at Automattic recruiting engineers and designers, giving her experience with developers and the DevTools sector. She joined Resend because of its product, culture, and emphasis on meaningful work, learning, and belonging, and she draws inspiration from art, reading, music, pottery, Ikebana, and conversations with candidates. Outside recruiting, she would likely work with teenagers through teaching or volunteering, cites Argentinian Patagonia as a favorite destination, and advises recruiters to keep learning, welcome feedback, learn from skilled peers, and approach candidates with kindness.

Resend has expanded its headless capabilities so that functions previously limited to its dashboard can increasingly be accessed through its API, CLI, MCP server, and SDKs, enabling developers, human operators, and agents to manage email operations programmatically. Recent additions include an Email Metrics API for deliverability and engagement reporting, webhook event management tools for inspecting, replaying, and securing deliveries, and APIs to cancel or duplicate broadcasts, share sent or received emails through expiring read-only links, duplicate automations as disabled drafts, rename segments and API keys, and analyze clicked links in broadcasts. These features support custom analytics dashboards, embedded customer experiences, automated operational workflows, and agent-based account management, while preserving the dashboard as an option for visual administration. Resend says it will continue working toward complete parity across interfaces and introduce more granular controls for areas such as API key provisioning, webhook filtering, and access scoping.

Resend announced the hiring of Roberto Braga to establish its Growth discipline, drawing on his more than 10 years of experience scaling technology businesses through experimentation, product strategy, SEO, ASO, email marketing, paid acquisition, content, and partnerships. Braga co-founded and served as CMO of YC-backed BX Blue before its acquisition by PicPay, where he later led organic growth, and most recently worked as Reddit’s Country Growth Lead in Brazil, helping double daily active users. He said he joined Resend to work closer to product development and systematize the factors attracting and retaining its users, while reconnecting with a longstanding interest in email that began with managing a university mail server. Based in Brasília, Braga cites his family, writing, data analysis in Google Sheets, and conversations with users as sources of inspiration, and advises growth marketers to prioritize understanding customer problems over chasing new tools and frameworks.

Resend has hired Julia Zettel as Video Producer to expand its original video, educational, launch, and community storytelling beyond product-focused communication. With more than a decade of experience and previous work for brands including Zee.Dog and Globo, Zettel developed her interest in audiovisual storytelling through a childhood surrounded by television and music production and later pursued Social Communication and AV studies. She initially collaborated with Resend on editing and a larger filming project before joining full time, citing the company’s design and attention to detail as key attractions. Zettel draws creative inspiration from films, music videos, travel, physical spaces, and online content from brands such as Rapha Films and Figma, relies primarily on Adobe Premiere and Adobe Podcast, and encourages aspiring producers to take on challenging projects while learning directly from experienced people as well as digital tools.

Resend has hired Kiersti Esparza as a Deliverability Engineer on its Trust & Safety Squad to help scale its email-sending infrastructure. Esparza brings nearly 20 years of experience in email operations and deliverability, including roles building teams at Marketo, leading consulting at Twilio, and working in deliverability engineering at Klaviyo. She describes deliverability as a continually evolving field that requires creative analysis, technical understanding, and adaptation to changing threats and authentication standards. Drawn to Resend’s developer-focused approach, infrastructure ambitions, and culture of transparency and partnership, she joins as an individual contributor working on foundational systems. Esparza also values the deliverability community and mentorship, enjoys travel, gardening, art, city planning, and woodworking, and advises aspiring operators to develop expertise in overlooked but essential infrastructure problems, where scarce knowledge can create significant leverage.