SendGrid
SendGrid is a cloud communications platform specializing in transactional email delivery, email marketing, and sender infrastructure for businesses.
Last updated August 26, 2026
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Overview
SendGrid is an American business-to-business communications software brand focused on email delivery and email marketing. Founded in 2009 by Isaac Saldana, Jose Lopez, and Tim Jenkins, the company was created to help software developers and online businesses send large volumes of reliable transactional email without building and maintaining their own mail infrastructure. Its service supported messages such as account confirmations, password resets, shipping notices, friend requests, notifications, and newsletters. The company was incubated through the Techstars accelerator program and obtained early backing from Highway 12 Ventures, SoftTech VC, Foundry Group, and other technology investors. Its cloud-based model combined application programming interfaces and software tools with operational services needed for large-scale email delivery. These included Internet service provider monitoring, domain authentication, DomainKeys, Sender Policy Framework support, feedback loops, link tracking, and reporting on opens, clicks, bounces, unsubscribes, and spam complaints. SendGrid expanded from an infrastructure API into a broader email communications platform. It added tools for marketing campaigns and audience communication while continuing to serve developers and technology companies through APIs and integrations. In 2012 it partnered with Twilio to bring email together with other application communications capabilities, including SMS and push notifications. SendGrid later offered a freemium entry point, a pay-as-you-go Lite option, and paid Essentials, Pro, and Premier tiers, although its free API and free marketing-campaign plans were retired in May 2025 according to the supplied reference material. The business grew through venture financing, including a $750,000 seed round announced in 2009, a $5 million Series A in 2010, a $21 million Series B in 2012, a $20 million Series C in 2014, and a $33 million Series D in 2016. Sameer Dholakia, formerly of Citrix, became chief executive officer in 2014. SendGrid completed an initial public offering on the New York Stock Exchange in November 2017, marking its transition from a venture-backed software company to a public cloud communications provider. Twilio announced a plan to acquire SendGrid in October 2018, valuing the transaction at approximately $2 billion, and completed the acquisition on February 1, 2019. SendGrid subsequently operated as part of Twilio's communications platform and became commonly described as Twilio SendGrid. Its capabilities complemented Twilio's programmable voice, messaging, and customer-engagement products by providing email as another channel for application and business communications. The brand has also been associated with the 2013 controversy known as Donglegate, involving the firing of developer advocate Adria Richards after an incident at a technology conference. The episode generated extensive discussion about workplace conduct, public criticism, and corporate responses in the technology industry. In the post-acquisition period, SendGrid remained a major email delivery and marketing brand within Twilio. Supplied reference material states that Twilio planned further brand consolidation in 2026 by merging the SendGrid.com website into Twilio.com.
History
SendGrid was founded in 2009 by Isaac Saldana, Jose Lopez, and Tim Jenkins to provide reliable, scalable email delivery through a cloud service. The founders developed the business for software companies and online services that needed to send transactional messages but did not want to operate their own mail servers or manage the complex reputation and deliverability issues associated with high-volume email. SendGrid was accepted into the Techstars accelerator, which helped establish its early investor and technology network. In December 2009, the company announced a $750,000 financing round led by Highway 12 Ventures. A $5 million Series A followed in April 2010 from Foundry Group, SoftTech VC, Highway 12 Ventures, and individual technology investors. The financing supported product development and the expansion of SendGrid's hosted email infrastructure. In January 2012, the company raised a $21 million Series B led by Bessemer Venture Partners. SendGrid opened a Denver office in August of that year, strengthening its presence in Colorado and providing a base for continued growth. SendGrid broadened its communications ambitions in December 2012 through a partnership with Twilio covering SMS and push notifications. In June 2013, it introduced a new email marketing service, moving beyond a primarily developer-oriented delivery API toward tools for marketers and business users. The platform continued to combine sending infrastructure with deliverability services, authentication support, campaign tools, and performance measurement. A major reputational controversy occurred in March 2013. SendGrid fired developer advocate Adria Richards after an incident at a technology conference involving comments made by other attendees and Richards's public response. The dispute, widely referred to as Donglegate, generated criticism and debate across the technology industry concerning harassment, public shaming, employment decisions, and the responsibilities of companies responding to conference incidents. In September 2014, Sameer Dholakia, a former Citrix executive, became chief executive officer. SendGrid raised a $20 million Series C in December 2014, led by Bain Capital Ventures with participation from existing investors. A $33 million Series D followed in November 2016, again led by Bain Capital Ventures. These rounds supported the company's expansion as an enterprise email platform and helped prepare it for public markets. SendGrid went public on the New York Stock Exchange on November 16, 2017. Its public-company period was relatively short. In October 2018, Twilio announced an agreement to acquire SendGrid for approximately $2 billion. The transaction combined SendGrid's email delivery and marketing capabilities with Twilio's programmable communications products. Twilio completed the acquisition on February 1, 2019, after which SendGrid operated as a Twilio brand and was often presented as Twilio SendGrid. Within Twilio, SendGrid continued to provide transactional email APIs, SMTP relay, marketing campaigns, deliverability monitoring, and analytics. Its service addressed both application-generated messages and promotional communications, including account notices, receipts, shipping updates, newsletters, and automated customer journeys. The platform historically offered free and paid plans, including a pay-as-you-go Lite plan and expanded Essentials, Pro, and Premier tiers. The supplied reference material states that Twilio ended SendGrid's free email API and free marketing-campaign plans in May 2025. It also reports that the platform processed 75.1 billion emails during Cyber Week 2025, representing a 14.6% increase from the previous year's record. In February 2026, Twilio reportedly announced plans to merge the SendGrid.com website into Twilio.com, indicating further consolidation of the acquired brand's digital presence while retaining SendGrid's email capabilities within Twilio's broader communications portfolio.
- 2019
Acquisition by Twilio
[1]Twilio completes its acquisition of SendGrid on February 1.
- 2017
Initial public offering
[1]SendGrid begins trading on the New York Stock Exchange on November 16.
- 2014
Sameer Dholakia becomes CEO
[1]Sameer Dholakia joins SendGrid as chief executive.
- 2013
Email marketing service launches
[1]SendGrid releases a dedicated email marketing service.
- 2012
Denver office opens
[1]SendGrid opens an office in Denver, Colorado.
- 2010
Series A financing
[1]The company raises $5 million in Series A financing.
- 2009
SendGrid is founded
[1]Isaac Saldana, Jose Lopez, and Tim Jenkins establish SendGrid and take the company through the Techstars accelerator.
- 2009
First disclosed financing
[1]SendGrid announces a $750,000 round led by Highway 12 Ventures.
Products and positioning
A developer-friendly, cloud-based email infrastructure and marketing platform that enables businesses to send, monitor, authenticate, and analyze large-scale transactional and promotional email without operating their own delivery systems.
Transactional email API
SendGrid Email API
A cloud API for sending application-generated email at scale. Typical uses include account verification, password resets, receipts, shipping notifications, alerts, and other event-triggered messages. The service is designed for software developers and includes delivery infrastructure, monitoring, authentication support, and reporting rather than requiring customers to run their own mail servers.
Email infrastructure
SendGrid SMTP Relay
A hosted SMTP-based delivery service that allows applications and systems to route outgoing email through SendGrid. It provides a managed alternative to maintaining an in-house mail-transfer system and is supported by deliverability controls, sender authentication, bounce handling, and performance reporting.
Email marketing · 2013
Twilio SendGrid Marketing Campaigns
A set of tools for creating and distributing newsletters and promotional email campaigns. It supports audience management, campaign scheduling, templates, segmentation, and engagement reporting. The product extended SendGrid's original developer infrastructure into marketing workflows for business and communications teams.
Email operations and analytics
SendGrid Deliverability tools
Operational capabilities covering sender reputation, ISP monitoring, domain authentication, DomainKeys, Sender Policy Framework support, feedback loops, and email-performance reporting. Customers can track opens, clicks, bounces, unsubscribes, and spam complaints to diagnose delivery and engagement performance.
Controversies
2013
Donglegate and the firing of Adria Richards
SendGrid dismissed developer advocate Adria Richards after a dispute at a technology conference involving comments by attendees and Richards's public response. The incident, commonly called Donglegate, prompted widespread debate over harassment, public criticism, employment decisions, and corporate accountability in the technology sector.
Brand decisions
2026
Planned website consolidation under TwilioStrategyBackground
SendGrid had operated as a Twilio-owned brand since the 2019 acquisition.
Action taken
According to the supplied reference material, Twilio announced plans in February 2026 to merge SendGrid.com into Twilio.com.
Aftermath
The planned change would consolidate the brand's web presence within Twilio while preserving SendGrid email capabilities in the parent platform.
2025
Retirement of free plansPrice changeBackground
SendGrid historically used free and paid tiers to provide an entry point for developers and smaller senders.
Action taken
According to the supplied reference material, Twilio retired the free email API plan and free marketing-campaign plan in May 2025, directing customers toward paid tiers.
Aftermath
Customers using the free offerings were required to transition to paid plans or discontinue those services.
2018
Agreement to be acquired by TwilioM&ABackground
Twilio and SendGrid served complementary parts of the cloud communications market, with Twilio focused on programmable communications and SendGrid focused on email.
Action taken
Twilio announced a planned acquisition of SendGrid for approximately $2 billion.
Aftermath
The acquisition closed on February 1, 2019, and SendGrid became part of Twilio.
Announced transaction value. $2 billion (October 2018 announcement)
2013
Launch of email marketing serviceProduct launchBackground
SendGrid sought to extend its developer-focused transactional email infrastructure into business marketing communications.
Action taken
The company introduced a dedicated email marketing service in June 2013.
Aftermath
SendGrid developed into a combined transactional-email and marketing platform.
2012
Expand into multi-channel application communicationsStrategyBackground
SendGrid's core business was cloud email delivery, while Twilio operated programmable communications services for developers.
Action taken
The companies partnered to incorporate SMS and push-notification capabilities into SendGrid's broader platform strategy.
Aftermath
The relationship foreshadowed the later combination of SendGrid's email business with Twilio's communications portfolio.
Recent events
- 2026
Twilio plans to consolidate SendGrid web presence[2]
Other
According to the supplied reference material, Twilio announced that the SendGrid.com website would be fully merged into Twilio.com in February 2026.
- 2025
SendGrid retires free API and marketing plans[2]
Pricing
According to the supplied reference material, Twilio retired SendGrid's free email API and free marketing-campaign plans in May 2025, requiring affected customers to move to paid tiers.
- 2025
SendGrid records Cyber Week email volume growth[2]
Other
The supplied reference material states that SendGrid processed 75.1 billion emails during Cyber Week 2025, up 14.6% from the prior year's record.
- 2019
Twilio completes SendGrid acquisition[1]
M&A
Twilio completed its acquisition of SendGrid on February 1, 2019, bringing the email platform into its cloud communications portfolio.
- 2018
Twilio agrees to acquire SendGrid[1]
M&A
Twilio announced plans to acquire SendGrid in a transaction valued at approximately $2 billion.
- 2017
SendGrid completes New York Stock Exchange debut[1]
Other
SendGrid became a publicly traded company on the New York Stock Exchange on November 16, 2017.
- 2014
Sameer Dholakia becomes SendGrid chief executive[1]
Leadership change
Former Citrix executive Sameer Dholakia joined SendGrid as chief executive officer.
- 2014
SendGrid announces $20 million Series C round[1]
Other
Bain Capital Ventures led a $20 million Series C financing, with participation from Bessemer Venture Partners and Foundry Group.
- 2012
SendGrid partners with Twilio for broader application communications[1]
M&A · Other
SendGrid and Twilio partnered to combine email delivery with SMS and push-notification capabilities.
- 2010
SendGrid secures Series A financing[1]
Other
The email software-as-a-service company raised $5 million in Series A financing from Foundry Group, SoftTech VC, Highway 12 Ventures, and individual investors.
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