Top 11 Email Relay and Deliverability Providers for High-volume Senders

Brevo is one of the best free email marketing services for brands on a budget. Not only does it offer a long list of features to help with email marketing, but it also brings a decade of deliverability expertise. In fact, according to their website, they guarantee a deliverability rate of 97%.

SMTP is one of the top email marketing services for small businesses, helping them to send high-volume emails at an affordable price. Each month, SMTP sends billions of emails by means of its secure and reliable email delivery platform, minimizing the chances that your messages will be mislabeled as spam. As a matter of fact, according to their website, SMTP users generally enjoy an increase of as much as 60% in delivery rates and a return on investment of three times higher compared to other deliverability providers.

All in all, it’s very easy to use. It offers good value for money and is a great choice if analytics and reporting are at the top of your must-have features list.

Along with Sendinblue, SendGrid (by Twilio) is rated as one of the top AI email marketing platforms that’s trusted by global companies like Uber, Spotify, and Yelp. With the help of a proprietary mail transfer agent (MTA), SendGrid sends more than 90 billion emails per month at an average delivery speed of below two seconds. Combine these impressive numbers with the hundreds of online reviews it has already received and it deserves its mention as an established player in the transactional email software niche on Capterra’s shortlist.

Glock Software’s email marketing solutions were created to help identify issues with email deliverability. Aimed at marketers, their tools simplify testing and monitoring of email placement.

It offers a number of tools that include an Inbox Email Tester, DMARC Analytics, IP Reputation Monitor, and Bounce Tracker. For example, with its Inbox Email Tester, you simply send your email to the address provided and you’ll get more insight into where your email ends up.

They also have a team of experts that will help you to boost your deliverability and see to it that your email messages reach the inboxes of your recipients. In addition to professional deliverability services, they also offer email consulting services.

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ActiveCampaign, one of the leading email marketing software platforms, is the brains behind Postmark, an email delivery service. Trusted by names such as Minecraft and Webflow, Postmark will slide seamlessly into your MarTech stack.

One way that it provides deliverability that you can build your brand upon is by carefully screening all new senders. This way, they ensure that their product doesn’t get used by spammers. They’ll also help you to implement email best practices and keep marketing and transactional emails separate to protect your deliverability further with the help of message streams.

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DuoCircle provides email hosting services to SMBs and enterprise clients, helping them to keep their emails safe from spam filters, spoofing, malware, and hackers. Per month, they process more than 100 million email messages for thousands of clients across the world that include household names like Airbnb and Toys R Us.

Included in their comprehensive list of email deliverability services are email authentication, sender reputation management, email monitoring, and deliverability analysis. What’s more, they also include security services like phishing protection.

For help specifically with email deliverability, you can expect first-class IP reputation handling. And, if your computer should get compromised, DuoCircle’s Outbreak Protection will help you to protect your IP reputation.

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Mailgun is an all-in-one email delivery platform that’s found the trust of over 150,000 businesses and developers. Along with SendGrid, it’s rated as an established name in the transactional email software niche. What makes them such a popular choice is their intuitiveness, APIs, and level of support.

If you specifically need help with email sending, their software can handle the delivery process automatically. Similarly to some of the other tools in this niche, Mailgun will also separate your promotional messages from your transactional messages.

One standout feature that deserves special mention is their focus on personalization. Included in its platform is Recipient Variables that lets you add and personalize common fields like first name.

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Trusted by over 100,000 companies, Mailjet is one of the leading email service providers across the globe. Each month, their robust delivery infrastructure routes billions of emails.

It focuses on three main areas: email marketing, email API, and deliverability. If you specifically want to focus on deliverability, their dedicated team of highly trained deliverability experts will get to the root of your deliverability issues quickly and share ways to help improve your email routing while at the same time fitting in with your business.

MessageBird (formerly called SparkPost) is the platform responsible for delivering nearly half of all commercial emails across the world. Trusted by major brands like Booking.com and Twitter, each year, it sends trillions of emails. However, if you merely want to send a hundred messages, you’ll enjoy the same low latency.

Some of its notable features include automated delivery optimization by default and a range of tools to help you track reputation. Its toolset is supplemented with their dedicated deliverability specialists who continuously work with inbox and ISP providers to fix problems. What’s more, it also comes pre-configured for top inbox placement.

If you thought that Amazon was only for selling and buying products, you would be very much mistaken. It also includes a cloud email service provider — Amazon Simple Email Service — that can be used for sending bulk emails. And, yes, Amazon has complete faith in its own product that it uses it to send hundreds of billions of emails each year.

Plus, Amazon isn’t the only big name that uses Amazon SES for boosting sender scores and email deliverability. Netflix also relies on it for email delivery. Before migrating to Amazon SES, they used an in-house solution. What attracted them to Amazon was its global reach, flexibility, and cost-effectiveness.

MailerSend by MailerLite is a cloud-based transactional email system that was built for developers to help them enjoy high deliverability, yet it’s intuitive enough so that teams without a tech background can also use it. Not only does it offer great intuitiveness, but also flexibility allowing you to send only a few emails or quickly grow your campaigns to over a million.

Its SMTP relay service is fast and secure. It’s also optimized for maximum deliverability, eliminating the need to manage your own SMTP server. Then, to help you protect your reputation, it also offers a team of deliverability specialists that can take care of those more technical details.