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.

Update on Security Incident and Additional Security Measures

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What Happened On April 8, the SendGrid account of a Bitcoin-related customer was compromised and used to send phishing emails. We initially believed that this account takeover was an isolated incident and worked with our customer to help them recover control of their account and minimize the damage of the attack. After further investigation in collaboration with law enforcement and FireEye’s (Mandiant) Incident Response Team, we became aware that a SendGrid employee’s account had been compromised by a cyber criminal and used to access several of our internal systems on three separate dates in February and March 2015. These systems

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Sender Policy Framework (SPF): A Layer of Protection in Email Infrastructure

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When email is sent from one server to another, simple mail transfer protocol (SMTP) is used to get a message from the sender to the receiver. As an SMTP service, SendGrid facilitates this process. One security weakness in the infrastructure of email is the ability of any sender or host to identify themselves, and their email, as any domain that they wish. This makes it difficult for receivers to trust that a message is actually from who it says it’s from. It also makes senders uneasy knowing anyone out there can send mail from their domain and potentially tarnish their brand’s

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The Trouble with Tech Debt and Information Debt

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It might be weird to imagine, but the first things that come to mind when I think of tech debt and information debt is Star Trek and cats. Specifically, I think of tribbles and wrangling kittens. You might think this is a total stretch, but let me explain… Tribbles are basically little fluff balls that can multiply seemingly exponentially in a short amount of time if exposed to food. They’ll get everywhere, but are easy to capture once you get them away from food. Kittens, on the other hand are wonderful little animals that are so cute and needy, they

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Email Marketing with the Birthday Email

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I love birthdays, even if it means growing older. I recently celebrated my birthday and because I am constantly encouraging segmentation based on subscriber information, I was looking forward to seeing which companies would use my demographic information to target me with a birthday email. Timing Matters Two weeks before my birthday, I received my first birthday email from Sephora with the subject line “Happy (early) birthday, Carly!”. I thought this was an excellent way to not only use my birthday information, but to use it early to cut through the clutter of other emails I would receive on my

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Email Marketing: How to Remedy Poor Expectation Setting

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In a perfect email relationship, both the sender and recipient are on the same page about what kind of email will be sent and how often because proper expectations were set at the point of sign up. Unfortunately, poor expectation setting usually means that your recipients are taken by surprise and unexpected messages are a leading cause of spam complaints (yikes!). Senders with good intentions can easily find themselves in this ugly situation, but we’ve got your back! From our latest webcast Great Expectations: Setting Your Email Marketing Up For Success our email deliverability consultant, Luke Martinez, shared some tips on what to

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Google Inbox: Tips For Email Marketers

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It’s been about six months since Google Inbox stepped out into the spotlight. Shortly after Google made its big announcement, it became clear that email marketers would need to pay close attention. Here are two Inbox features that email marketers should be aware of: Bundles – this allows users to group emails by category, and control when you receive a specific “bundle.” (i.e.: “send me my promotion bundle once a week”) Highlights – this is Google’s version of text preview, giving users the ability to see a flight status, reservation, or picture without opening an email. What this means for

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Blacklisted? Check These 7 Popular Blacklists To Keep Your Reputation Intact

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Earlier this spring, we shared 5 resources that can help you keep track of your sending reputation. Another good way to keep a check on your reputation is to find out if you are on any blacklists (a.k.a. blocklists). Blacklists contain lists of IPs or domains that pose a threat to consumer inboxes. Your email service provider may automatically alert you if you’re added to one, but it’s good to check for yourself. If you are on a blacklist, act quickly. Just a few spam complaints can add a legitimate sender to a blacklist. Here’s an example of what it

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