Resend

Zeno Rocha and Bu Kinoshita started the email-development project in August 2022 and gained their first paying customer in September. Accepted into Y Combinator in November for its W23 batch, they publicly launched the open-source React Email component library in December.⁠[1]

The company was incorporated in January 2023, with Jonni Lundy joining the founding team to run operations. Its current company profile names Rocha, Kinoshita and Lundy as the three founders. Resend opened to the public in June after a waitlist phase.⁠[1][2]

Resend announced a $3 million seed round backed by Y Combinator, SV Angel and founders of companies including Figma, Vercel and Supabase. The announcement reported about 10,000 developers and more than seven million transactional emails sent through the platform at that time.⁠[3]

The company announced an $18 million Series A led by a16z, with returning investors including Y Combinator and Basecase. Resend reported more than 200,000 developer users and over 300,000 weekly React Email downloads, and planned to expand its developer-focused email infrastructure.⁠[4]

Resend announced its acquisition of background-job service Mergent, with founder James Martinez joining the team. Mergent had participated in Y Combinator S21, and Resend already used it for domain-verification jobs. The announcement emphasized reliability, scalability and developer experience, and provided a 90-day transition period for the existing service.⁠[5]

Resend acquired Briefer, a collaborative data-analysis workspace combining SQL and Python, with founders Lucas da Costa and Lucas Vieira joining. Briefer had participated in Y Combinator S23. Resend said the team would strengthen its data capabilities and announced plans to open-source the enterprise code after the hosted-service transition.⁠[6]

Automations connects application events to email workflows through triggers, delays and conditional steps for onboarding, re-engagement and other lifecycle messaging. Workflows can be built visually or with AI assistance and operated through APIs, SDKs, MCP or the command line, with execution history available for inspection.⁠[7]

Resend reported three million users, up from one million six months earlier, while its team grew from 25 to 43 people. It described four areas of functionality—sending, receiving, broadcasting and automation—and said it had been profitable since 2025. These operating figures were company-reported.⁠[8]

Resend introduced its Headless Dashboard Initiative to expose more dashboard actions through APIs, MCP and its CLI. Examples included email metrics, webhook-event replay, broadcast cancellation, automation duplication and email-sharing links. The announcement set an ongoing interface-coverage goal rather than claiming every dashboard function was already available.⁠[9]

Resend offers HTTP APIs, SMTP and language SDKs for transactional and marketing email, with React Email components for composing messages. Its platform supports contacts, broadcasts and webhooks for events such as delivery, bounces, opens and clicks. Authentication, domain configuration and delivery outcomes remain operational concerns for each sender.⁠[10]

Resend operates as a distributed remote team and publishes a handbook describing its working practices and product history. Its brand resources provide original identification assets; this entry uses the official black wordmark.⁠[2][11]

Website: https://resend.com/ (opens in a new window). X: https://x.com/resend (opens in a new window). LinkedInLinkedInLinkedIn is a social networking platform for professionals. It was founded in 2002 by Reid Hoffman and others, launched in 2003, and listed on the New York Stock Exchange in 2011; after Microsoft acquired it for approximately $26.2 billion in 2016, it became a wholly owned Microsoft subsidiary. Its revenue comes from membership subscriptions, advertising, and recruitment solutions.Open the full entry: https://www.linkedin.com/company/resend/ (opens in a new window). YouTubeYouTubeYouTube is Google’s video-sharing and creator platform, founded in 2005 by Steve Chen, Chad Hurley, and Jawed Karim and acquired by Google in 2006. Built around video uploading, viewing, and creator earnings, the platform has developed Shorts, YouTube Music, Premium, YouTube TV, and products for children, and is headquartered in San Bruno, California, United States.Open the full entry: https://www.youtube.com/channel/UC0FkhoSz2kYqHVBk4L0QYIg (opens in a new window), under @resendlabs.⁠[10][12][13][14]