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.

How To Web Conf: Hacking Your Way to Product Excellence

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Back in November, I had the pleasure of speaking at How To Web in Bucharest, Romania about a subject very close to my heart – hackathons. More specifically, how product teams can use hackathons, both the environment and the hacker mentality, to drive their products forward in a way that is both engaging and creatively flexible for developers. The main talk will be online on the How To Web YouTube channel shortly, but here are some of the key points I made: Have Restriction-Free Time Part of the draw of many hackathons is the freedom to experiment in a no-pressure

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Introducing the Deliverability Center

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If you’ve spent any amount of time sending email for either personal or professional reasons, you’ve probably encountered a very common and very frustrating problem: understanding email server response codes. When you send an email that fails to get accepted, the response codes sent back by ISPs like Yahoo, Gmail, and even home-brewed Mail Transfer Agents (MTAs) can be unhelpful, bizarre, and sometimes downright confusing. Here are a few examples of what I mean: 550 5.7.1 RESOLVER.RST.NotAuthorized; not authorized Huh? What’s not authorized? Who? Where? 554 Reject by behaviour spam Who is this “behavior spam” and why is he rejecting

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Re-thinking the Re-engagement Email

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My New Year’s resolution is to show the email world a better way to manage their recipient engagement. The main focus of my engagement argument is around re-engagement campaigns. These campaigns are traditionally sent to subscribers who do not engage with your email—those you want to “win-back” to being engaged with your product or service. Re-engagement Emails are Broken But, the data tells us that re-engagement campaigns are a broken concept. In fact, we have data that shows reengagement campaigns can send an otherwise good sender directly to the spam folder. Re-engagement campaigns target only the least engaged recipients and then

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Code Challenge: Incoming Email Analysis with Crunchbase and the Parse Webhook

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In my final Code Challenge blog post, I’m taking a look at CrunchBase. If you’d like to read more about this Code Challenge, and see a list of other posts, visit my first post: 15 Days of Code Challenge. In my previous blog posts we looked at a Python module and Machine Learning API that let us analyze incoming email by their sentiment and concepts based on the body of the email. In this post, I want to showcase another way to classify and prioritize your incoming email. We’ll look at the CrunchBase API and get information from their database on the sender and their

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SendGrid’s Experience Converting Relay Service to Go

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Last year I talked about SendGrid’s decision to use Go as our primary development language. For the most part this has affected only new services. Recently though, we have completed a rewrite of one of our highest load components to Go and I thought I would share the story and some of the lessons learned. Background As some background, almost a year ago one of our engineers who was helping to make the pitch of why we should use Go rewrote the service that handles final customer IP selection/transmission of data to remote SMTP servers as a proof of concept/example

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Happy New (Email) Year! – Q&A

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Last Tuesday we hosted our original webcast Happy New (Email) Year! and received a plethora of great questions. To share the wealth, and further assist you in keeping those email resolutions you made, our presenters Brian Albers and Bryan Hammerquist took some time to answer your questions below: 1. Are the CAN-SPAM requirements mainly for marketing emails, or do they apply to simple transactional emails? For example, a notification which we send as no-reply? CAN-SPAM covers all commercial electronic messages, which are defined as “any electronic message with the primary purpose of commercial advertisement or promotion of a commercial product or service.”

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Email Matters: We Think So, and So Does Our Customer, Pandora

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At SendGrid, we deliver email that matters. And the best way to improve deliverability is to send email with the right message, to the right person, at the right time, with the right frequency. This is what drives what we do here at SendGrid, and last month, we hosted our first Email Matters event in San Francisco dedicated to educating our customers about the future of email delivery and user engagement. During the event, we had the opportunity to sit down with several of our customers, including David Hampian, the marketing manager at Pandora. As a company with over 250

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