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.

Confirming Why SendGrid Built Its Own MTA

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A number of people, both inside SendGrid and out, have asked me about our decision to build our own message transfer agent (MTA) versus using one of the commercial products that exist in the market. In light of recent market news concerning the merger of two commercial MTA vendors, I thought it would be a good time to share my thoughts on this. Back in the day In the very beginning, SendGrid used a modified version of Postfix, one of the most popular open source MTAs, to receive and deliver email. This worked pretty well until we started running into

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Google Inbox: Insights and Predictions

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At the close of the year we sat down with Paul Kincaid-Smith, SendGrid’s VP of Email Delivery, to get his take on Google Inbox. With Google just releasing usage stats for Inbox, we thought we’d share what he had to say: 1. How does Google Inbox increase productivity? Google Inbox cuts through email clutter. We receive more email than ever before. According to the Radicati Group, almost 200 billion are sent every day–about twice as much as only five years ago. Much of it we have asked for and want, but may not want to read right away. Google Inbox helps

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2015 Predictions for DevOps

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The following is a guest post from Matt Chesler, DevOps Architect for TheLadders, the premier mobile network for career driven professionals. We sat down with Matt to learn about what he thinks lies ahead for DevOps in 2015.  Q: How do you think adoption of DevOps practices (Agile, etc.) will change in 2015? A: DevOps practices aren’t going to change, they will continue to grow. If you look at current DevOps job listings and listen to what recruiters are looking for, DevOp engineers, etc. are becoming far more prevalent than they used to be. There’s recognition in the industry that this is

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Collect User Feedback with Stamplay and SendGrid

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Earlier this week I had the good fortune of being reminded of Stamplay. Stamplay is a browser-based web application creator that allows the user to skip backend coding. By connecting multiple components, assigning actions to those components, then coding-up the frontend in any way you want. It’s pretty amazing how quickly you can throw together fully (and I stress fully) functioning applications without manually hooking up a bunch of APIs and writing a ton of backend code. I wanted to take this opportunity to build a super-quick User Feedback app, that although is very simple, would have taken a lot longer

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Stretch Your Email Marketing Budget in 2015

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Despite predictions of its impending doom, email is here to stay. Not only are companies expanding their transactional email programs to further engage their users, but 61% plan to increase their marketing email spend in 2015. There is a lot of incredible new technology giving you more control over your email marketing than ever before. But is it worth it to pay a premium to have access to all these features, or is it better to go for a no-frills solution to stretch your budget as far as it can go? In my experience, most companies don’t have time to utilize

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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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