SendGrid's Email Deliverability Blog


From email deliverability best practices, to hackathon highlights, API tutorials, and everything in between, the SendGrid blog is your destination for all things email. Browse our most recent posts in the main feed or filter by category. Be sure to subscribe to the blog to get a daily digest of posts and reach out to us in the comments to let us know how we're doing.

After 32 Years, Email Still Dominates

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Over the 32 years since email was invented, it’s grown in a way that few other technologies have. From something that was only used internally at organizations, email is now a necessity for everyone. As the world’s leading email delivery service, SendGrid is in a unique position to see how email continues to grow, and where it’s headed in the future. During 2013 and 2014, we collected data over two separate 10-day time periods, creating a data set of over 8 billion emails sent by more than 125,000 companies. From that data and from speaking with our own email experts,

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Help Your Customers Get Better Email Deliverability Rates

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The following is a guest post from Jesse Wynants at Prezly. Learn how Prezly has leveraged SendGrid to send email on behalf of their users as part of our Marketing Solutions Partnership below, and learn more about Jesse and Prezly at the conclusion of the post. We’ve been using SendGrid since June 2011 to send email on behalf of our users. This means that users use our service to send email, but their own email address is in the FROM address. (Essentially, SendGrid provides the backend email infrastructure, while we provide our frontend PR services.) Sending emails on behalf of

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Baligam Uses SendGrid to Send Over 18 Million Messages Each Month

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Founded in 2010, Baligam is Israel’s top daily deal site. Every day, they provide their subscribers with thousands of deals they can take advantage of. In order to do this, Baligam uses a few different SendGrid functions. Baligam’s primary emails consist of three different types of deal newsletters: daily, tourism, and flash sales. These newsletters are the source of Baligam’s customer communications and revenue. In addition to these marketing email communications, Baligam also uses SendGrid for their transactional email needs. User registration, subscription confirmation, password change notification, and shipping and order confirmation emails are all automatically sent through our SMTP

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5 Years and 273 Billion Emails

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This summer, we’ve been celebrating the five-year anniversary of SendGrid. Part of that celebration has been looking at some of the major scaling milestones and accomplishments of our customers and the company through retrospectives, webcasts, and an infographic, all shared in part, below.  Scale A big part of helping our customers scale has been learning from our own growth. Since graduating from TechStars, SendGrid has grown from 3 employees to 250 and from 0 emails sent to 273 billion. Throughout this time, we’ve learned that reliability, support, and providing a powerful infrastructure are critical to supporting large email volumes–2% of

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Tracking Email Using Microsoft Azure and the SendGrid Event Webhook (Part 2)

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Welcome back to the second part of my series about building a Windows Phone 8.1 app to track email powered by Microsoft Azure and SendGrid’s Event Webhook. If you haven’t read part one in this series, please do so before continuing. Recap In part one, we implemented the SendGrid Event Webhook listener using C# ASP.NET hosted on Microsoft Azure. In this post (part two), we will create a Windows Phone 8.1 app that displays email tracking data via the SendGrid Web API. In part three of this series, we will send push notifications from our SendGrid Event Webhook listener when

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4 Email Subject Lines To Learn From

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Subject lines can make or break the open rates for your email. Therefore, it’s imperative to continuously test the content, tone, and length of your subject lines to see which ones work better. Often the results of your tests will surprise you and your gut instincts will be proven wrong. It is important to having data to back up your decision-making. It’s also helpful to learn from other senders. Recently, we’ve seen some subject lines that missed the mark for being too ambiguous, too forward, or too generic. So let’s take a look to learn from them: Curious What’s Inside?

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JSON Web Tokens (Again!) and Koa.js

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A few weeks ago, I wrote about using JSON Web Tokens (JWT) as an alternative method of authentication using Go. The post itself contains a basic explanation about JWT and some links for content. In this post, I want to cover pretty much the same things using Koa, a new framework for Node.js. Koa is mostly a middleware framework which uses generators (only available under the Harmony flag) to control the flow of requests. The reason I mention that it’s a middleware framework is because it doesn’t come with most of the things you would expect a framework to provide, such

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