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.

It’s Now Easier to Deploy Some Demo Applications With the Heroku Button

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At SendGrid, we’ve created several demo applications to make developers’ lives easier. Deploying these applications has involved following their prospective README’s step-by-step guides. But now, we’re starting to make deploying some of our main applications such as the SendGrid EventKit, Parse API, and JavaScript below as easy as clicking a button – the Heroku button. sendgrid-eventkit – An open source project for integrating and receiving notifications for SendGrid’s Event Webhook. sendgrid-parse-api-example- An example application that shows how to use the SendGrid Parse Webhook. It’s additionally a boilerplate of code that you can adjust to your own needs sendgridjs- A proxy so you

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The Myth of Opportunistic TLS and Email Privacy

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Back in June, SendGrid joined a large group of Internet companies in the effort to prevent dragnet surveillance of customer traffic. On our part this specifically involved adding opportunistic TLS—encrypting traffic to any mail server that supports it. While this does move us closer to the goal of complete customer privacy, there are some caveats that aren’t often talked about. Opportunistic TLS does provide better privacy than sending everything cleartext, but it does not provide any protection against an attacker attempting to hijack traffic to a specific domain. All an attacker needs to do is take over the domain, not

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ABCs of ISPs Questions Answered!

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We went back to school on Tuesday for our webcast ABCs of ISPs. Our presenters, Kristin Ferraro and Ryan Harris, not only shared some information on how to get delivered to the major internet service providers (ISPs), they also answered some great questions we were receiving live. Since everyone wasn’t able to see all those questions asked behind-the-scenes, we thought we’d pick a few of them to showcase below: What rate of spam could trigger Gmail to filter out messages? There are several factors that can go into Gmail taking the action to filter out messages. We believe it involves

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Introducing the Next Generation of SendGrid and Advanced Suppression Manager

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Over the last few months, we’ve been hard at work innovating how our customers engage and work with their SendGrid accounts. Today, we’re happy to announce that a new generation of the SendGrid Customer Portal is available for customers to try in beta. This optional, early-stage version of the new SendGrid Customer Portal provides SendGrid users with an improved user experience and interface consistency.   Moving forward, this new SendGrid environment will be the place to find new products, features, and enhancements. Log into the beta to find announcements every few weeks! To try the SendGrid Customer Portal beta, log

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Email Delivery Failure: What Causes It?

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Email delivery can be a frustrating business. You work hard to create emails that will capture your customers’ attention, and sometimes all of that hard work goes to waste. And despite your customers having asked to receive these emails, Internet Service Providers (ISPs—like Gmail, Yahoo, and AOL) and other filters can make can make 22% of them go undelivered. What’s a sender to do? First of all, it’s important to understand that it’s not personal. ISPs are just trying to sift through over 100 billion emails that are sent daily. This volume of spam makes it extremely difficult for ISPs to

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Open Source Documentation: One Year Later

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A year ago, we open sourced our documentation, with the hypothesis that it would improve the docs by adding feedback loops and removing barriers that discourage contribution. We also wanted to share what we had learned during the process. I’m glad to say that so far the results have been good, and the decision to open source our documentation continues to help us improve it as a product. Where We Are Now We’ve had 59 different contributors to the docs repo since we open sourced it, with around 15 of those contributors being community members rather than SendGrid employees. Considering

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Diversity at SendGrid

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Today we are taking the next step in our diversity efforts by releasing our demographic figures. We may not be the first to do this, however we are glad to be part of the movement in the tech industry to make it more diverse and inclusive. By becoming transparent with our figures we hope to not only positively influence the industry as a whole, but also hold ourselves accountable to continually measure and take steps to improve.     We have a multi-pronged strategy to help change the diversity imbalance both internally at SendGrid and in the industry as a

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