Best 7 SMTP Servers in 2021

SMTP stands for Simple Mail Transfer Protocol, and it’s an application used by mail servers to send, receive, and/or relay outgoing mail between email senders and receivers. When a user sends an email, the SMTP server processes the email, decides which server to send the message to, and relays the message to that server. The recipient’s inbox service provider, such as Gmail or AOL, then downloads the message and places it in the recipient’s inbox. Emails are an important means of communication between a website and its users. So, it’s essential to ensure that the emails are properly sent and delivered to the users’ inboxes. And, SMTP services help them achieve that goal.

In this article, we will share the best SMTP service providers with high email deliverability.


For over two decades, has powered over 100,000 businesses globally. They empower businesses to connect with their customers securely and reliably, maintain their reputation as trustworthy brands and build meaningful products with customer engagement at the core. Users get full reports on the number of sends and views; their domain reputation management features help ensure that the email always lands in the user’s inbox.

As a WordPress site owner, one can use to send automated site notification emails, registration emails, authentication emails, order confirmation from the store, status updates, etc.

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2. WP Mail SMTP

WP Mail SMTP is the easiest way to send WordPress emails reliably. At WP Mail SMTP, they build software that helps users fix their email deliverability issues and ensure that their website emails arrive in the inbox. Over the years, they have found that WordPress users struggle with email delivery. Oftentimes their emails didn’t send at all or were marked as spam. So, WP Mail SMTP started with a simple goal: build a WordPress SMTP plugin that solves email delivery issues, once and for all.

3. Sendinblue

Sendinblue is a popular email marketing service that also offers SMS marketing. In short, it’s an all-in-one marketing platform that also ranks as one of the best SMTP service providers on the market. Whether one needs to manage email campaigns, send text messages, or save time with automation, they can help them do it efficiently, on budget, and in their language. Sendinblue has a highly extensible API and designated relay service which instantly improves the email delivery for transactional emails.

4. Mailgun

Mailgun is how modern companies work with email. The platform’s ease of use, world-class support, and powerful APIs empower smart development teams to reach real customers at scale with a data-driven approach so their organization can grow faster. Send and track transactional and marketing messages effortlessly. Prevent fake signups and remove invalid email addresses from your list quickly. Partner with email experts to improve your deliverability and drive higher conversion rates. It is easy to integrate into your WordPress website. Whether you are an eCommerce store, a membership website, or a small business, Mailgun offers an easy-to-scale SMTP service to send your marketing and transactional emails.

5. Sendgrid

SendGrid provides a unique customer communications solution for every stage of a company’s growth. That’s why they are believed to have pioneered transactional email, have more delivery experts and support engineers than any other email provider, and continue to deliver new email and communication products to their customers. Sendgrid’s relay is easy to set up and works with any WordPress site. It includes delivery optimization tools, email analytics, email templates with a simple email editor, and integrations with third-party apps and services. SendGrid also provides complete analytics and real-time feedback on every email user sends.

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As far as email deliverability goes, SendGrid has tools that will improve it, like dedicated IP addresses and domain name authentication tools.


6. Amazon SES

AWS or Amazon Web Services is the industry leader in cloud computing infrastructure. They also offer Amazon SES or Amazon Simple Email Service as an add-on to their web services. It is a flexible and scalable SMTP service for developers and marketers to send marketing, notification, and transactional emails. It is a powerful cloud-based SMTP service to easily send marketing, notification, and transactional email campaigns. This SMTP service offers high deliverability and powerful features but is mostly geared towards developers and advanced users.

SMTP relay services

7. PostMark

Postmark helps deliver and track application emails. In a nutshell, the service replaces SMTP (or Sendmail) with a far more reliable, scalable, and carefree environment. In addition, users can track statistics such as the number of emails sent or processed, opens, bounces, and spam complaints. Postmark is one of the best SMTP services that specialize in sending transactional emails.

This mail client offers excellent analytics and security, as well as mobile-friendly responsive email templates, message events that can be triggered with simple web hooks, and more.



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