SendGrid
Email APISendGrid is a cloud-based email delivery platform that handles transactional and marketing emails at scale. In custom web application development, reliable email delivery is non-negotiable, password resets, welcome emails, order confirmations, invoices, and notifications all need to actually reach the inbox, not the spam folder. That's where SendGrid comes in. I use it to handle all outbound email for the applications I build. SendGrid manages the complex infrastructure of email delivery: IP reputation, DKIM/SPF authentication, bounce handling, and deliverability optimization. Their API lets you send emails with a single HTTP request, and their event webhook feeds back delivery status, opens, clicks, and bounces in real time. For apps that send thousands or millions of emails, you really don't want to be managing your own mail server.
How It Started
SendGrid was founded in 2009 by Isaac Saldana, Jose Lopez, and Tim Jenkins while they were participating in the Techstars accelerator program in Boulder, Colorado. Saldana, who had worked in email infrastructure at previous companies, understood firsthand how painful it was for developers to send email reliably from their applications. Email deliverability is one of those problems that looks simple on the surface but is actually incredibly complex, spam filters, blacklists, IP warming, authentication records, and feedback loops all need to be managed correctly. SendGrid solved this by offering email-as-a-service through developer-friendly APIs. The company grew rapidly, went public in 2017, and was acquired by Twilio in 2019 for approximately $3 billion, combining SMS and email communication under one platform.
Unknown Fact
SendGrid sends over 100 billion emails per month, which means it handles a significant percentage of all non-spam email traffic on the entire internet. But here's the lesser-known story: during their Techstars batch, the founders were originally working on a completely different product, a video-based learning platform. They pivoted to email infrastructure partway through the program after realizing the email problem they kept encountering was actually the bigger opportunity. Also, SendGrid was one of the first major tech companies to adopt a "Developer Evangelist" role, hiring developers whose entire job was to attend hackathons, write tutorials, and help other developers use the API. This strategy became a model that dozens of developer-focused companies later copied.
Visit: sendgrid.com