[3][4][5][6][7][8] The company was founded by Isaac Saldana, Jose Lopez, and Tim Jenkins in 2009, and incubated through the Techstars accelerator program.

It also handles Internet service provider (ISP) monitoring, domain keys, the sender policy framework (SPF), and feedback loops.

[7][22][25] Beginning in 2012, the company integrated SMS, voice, and push notification abilities into its service through a partnership with Twilio.

[15] SendGrid offers a freemium version and a Lite Plan (pay-as-you-go), as well as three expanded levels of service: Essentials, Pro, and Premier.

[34] After founding SendGrid in Riverside, California, in July 2009, Saldana, Lopez, and Jenkins enrolled the startup in the TechStars accelerator program and moved the company to Boulder, Colorado.

[22] Other participating investors included SoftTech VC, FF Angel, and TechStars founder David Cohen.

[22] In April 2010, the email software-as-a-service (SaaS) company received $5 million in Series A round funding from Foundry Group, SoftTech VC, and Highway 12 Ventures, as well as individual investors including David Cohen, Scott Petry, Dave McClure, and Matt Mullenweg.

[9][14][17] In December 2012, SendGrid partnered with Twilio to incorporate SMS and push notification services to its platform.

[52] In December 2018, a SendGrid shareholder filed a lawsuit in Colorado federal court in response to the planned acquisition.