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.

Release Notes – Features and Bug Fixes – September 3, 2010

Product, Technical

Welcome back! Reminder: if you wish to subscribe only to release notes on this blog, you can subscribe using this RSS feed. For real-time updates and system status, you can follow our Twitter feed or our centralized status page [RSS].

These efforts are all geared towards providing greater transparency and enhanced customer support. If you want to provide feedback (which we love), scroll down to the end of this post for several options.
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SendGrid: One Year Young

Company, Events

Today we take a moment to recognize the completion of our company’s first year in business and, more importantly, show our appreciation to those who made it possible.

Last August, our three co-founders officially “graduated” from the TechStars – Boulder class of 2009.  Last week, a new crop of companies emerged from the stage of the Boulder Theater – ready to take on the world.

As those 11 companies look forward to their first and formative years of operation, we look back – and in doing so, we feel very fortunate that we not only “survived”, but performed very well against our long list of company goals.

Some major milestones:

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How To Track Your Emails Using Google Analytics

Partnerships, Technical

Google Analytics ( GA ) is a great free resource to stay on top of your website’s performance, but did you know that GA is also useful for monitoring your outbound emails? In this post we show you how to use GA to gain statistical insight into your outgoing emails. If you are a SendGrid user, you will also learn how to use our REST API along with our free GA filter to simplify the process.

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We’ve delivered more than 2 billion emails

Carly Brantz Partnerships, Product

TechCrunch says we have delivered a Bajillion emails … close … actually, we have now delivered more than 2 Billion emails!

This has all been made possible by the 8,000+ awesome companies that have used our service and by putting together a phenomenal team. In the last few months we went from a team of 5, to a team of 18 and growing (we are hiring).

Our engineering team has adopted an awesome development process to produce higher quality software, with key feedback from companies like TwilioGetSatisfactionGnip, and SimpleGeo. Thanks guys! Meanwhile, our support team keeps rocking, they even help debug code on a Saturday night!

In addition to growing our team and enhancing our systems & processes, we have been expanding our feature set, mostly thanks to some great suggestions from our growing community. Friday was a particularly exciting day for us, just as we broke a milestone of achieving over 20 Million emails processed in a single day, we released the following features:

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Which protocol should I use to send email, SMTP or REST?

Tim Jenkins Best Practices, Product, Technical

We get asked quite often why we recommend customers use SMTP to send email to SendGrid, as opposed to using our REST API, and where one would be used over the other.  For options on how to integrate with SendGrid go here. To start, the absolute best method to send email through SendGrid is to set up a local mail server that queues all email from your application, and then relays the messages through SendGrid as a smart host.  This will have the least latency from your application’s perspective, and has the added benefit of handing your email off to a server that is fault tolerant.  If something goes wrong with internet connectivity between your servers and ours, a local Read More ›

Ready to make a difference? SendGrid is hiring!

Carly Brantz Company

SendGrid is a cloud based service that delivers emails on behalf of companies to increase their email deliverability.  We have also developed a platform that solves many of the current email problems and flexible enough for other companies to plug in functionality to solve future problems.  SendGrid has been growing really fast after launch and we want you to be part of the awesome company we are building.  We are looking for talented engineers that can help us innovate the email space and make a huge difference. Senior Web Applications Engineer SendGrid is looking for a senior backend engineer that can help us manage and innovate our web applications. Responsibilities: Manage a team of web developers and be responsible for Read More ›

Why you should not use in your emails

Carly Brantz Best Practices, Product, Technical

When we were designing our SendGrid platform, we tried to solve most of the existing email problems and make an extensible platform where other companies could add functionality and solve future problems. One of the current problems is taking incoming replies from emails. We noticed many companies sending automated or transactional emails to their users using a From email address in the form of This creates two huge missed opportunities that SendGrid users can now easily take advantage of by using our parse API. The first missed opportunity is communicating with users.  Companies such as Posterous, WordPress, Intense Debate, and Facebook have taken advantage of the wide adoption of email to develop great applications.  WordPress and Posterous allow users Read More ›

How SendGrid Found the SpamAssassin Y2K10 Rule Bug

Carly Brantz Product, Technical

One of the many things SendGrid does on the backend to determine if a user is having deliverability problems is scan the content through multiple enterprise spam filters multiple times per day for every user.  Some of the filters include Postini, CloudMark, Brightmail, IronPort, Barracuda, Mail Foundry, and SpamAssassin.  These filters are additional filters from our delivery monitory to ISPs such as Hotmail, Yahoo, Gmail, and AOL.  In the last couple of days we noticed that a lot of legitimate emails were triggering the SpamAssassin filter.  The following shows how our graph looks like: Read More ›

Joe Scharf Joins SendGrid

Carly Brantz Company

We are very happy to have Joe Scharf join our team.  Joe has tremendous technical experience as well as business development experience having degrees in Computer Science, Electrical Engineer, and an MBA.  Joe will wear many hats in the team so don’t be surprised if you see him all over the place.  Joe will help us provide much better support for our users and help optimize our infrastructure and better utilize our computing resources. SendGrid is still looking for talented individuals to grow its team so please checkout our jobs page and apply if you are the right fit.