Best SMTP Services Compared

7 Best SMTP Services for Email Marketing (Compared)

Are you looking for the best SMTP services for email marketing?

An SMTP service helps you to send emails to your users and customers from your website safely, without fail.

Emails are an important means of communication between your website and users. So, it’s essential to ensure that your emails are properly sent and delivered to your users’ inbox. And, SMTP services help you achieve that goal.

In this article, we’ll compare the six best SMTP services for email marketing in 2019.

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What is SMTP? Why You Need an SMTP Service?

SMTP stands for Simple Mail Transfer Protocol. It is the industry standard for sending electronic messages or emails. It uses proper authentication, which increases the chances of your emails being delivered properly.

SMTP Services for Email Deliverability

If you’ve got a website, then you may have set up automated user-triggered emails to notify users about their activity on your site. For example, when they register a new account, change a password, order a product, purchase a product, etc.

But a lot of times, your transactional emails like these may be failing to reach the users’ inbox. And, you may be losing lots of money because of the failure to communicate.

The main reason behind this problem is that your mailing system is not configured correctly. For example, if you’re using WordPress, then the problem occurs because its default PHP mail() function is not configured correctly by most hosting services.

So, the solution to this problem is to use an SMTP service that configures email authentication properly for you. For WordPress sites, you can use the most popular WordPress SMTP plugin WP Mail SMTP and fix email deliverability.

With that said, let’s take a look at the best SMTP services for reliable email marketing.

1. Sendinblue – Best SMTP Service

SedninBlue best smtp services

Sendinblue is the best SMTP service and also one of the most popular email marketing services in the world. It offers SMTP email service for both user-triggered transactional emails and bulk email campaigns. Also, it provides a powerful SMS marketing and live chat solution for your business.

Using Sendinblue, you can send transactional emails and highly targeted marketing emails to your users or subscribers. Backed by a team of email deliverability experts, it provides a reliable SMTP server for your business emails.

Sendinblue works well with WordPress and other marketing tools like OptinMonster, Google Analytics, and many more.

Pricing: Free plan with 300 emails per day. The starting paid plan Lite is available for $25 / month with 40,000 emails per month and no daily sending limits.

2 Mailjet – Popular SMTP Service


Mailjet is another popular SMTP provider and is designed for fast-moving teams that want a complete email marketing solution. It offers an easy to use email builder through which you can create responsive and attractive emails with just a few clicks.

Mailjet offers a free SMTP server that lets you send tons of emails with its robust delivery infrastructure. Setting up SMTP server is very easy with Mailjet. You can also integrate the SMTP service with any system.

And with a variety of ports on offer, you get greater flexibility as you can select a port that’s suitable for your client or ISP. You also get TLS or SSL encryption to secure your emails.

Pricing: Mailject offers a free plan with 6,000 emails per month (200 emails per day). Its paid plans start from $8.69 per month billed annually and you get 30,000 emails per month.

3. Mailgun – Top SMTP Email Service

Mailgun SMTP Relay Services

Mailgun is a super powerful SMTP provider for developers. Its powerful email sending infrastructure lets you send millions of transactional and bulk emails with higher delivery rates.

You can use Mailgun with a WordPress website easily. The popular SMTP plugin WP Mail SMTP also offers native integration with Mailgun to connect it to your WordPress site smoothly.

Mailgun is a highly scalable SMTP service. However, it’s quite complicated for beginner-level users.

Pricing: Mailgun offers pay-as-you-go pricing plans providing you the first 10,000 emails and 100 validations free every month. For 20,000 emails per month, you need to pay $5 / month. If you want a dedicated IP address, then you need to sign up with a Production plan which costs $79 / month.

4. SendGrid – SMTP Plugin for WordPress

SendGrid Email SMTP Services

SendGrid is a popular email delivery service available on the market. It allows you to send and create email newsletters, promotions, shipping notifications, password resets, and all types of emails with confidence.

SendGrid is user-friendly that you can easily integrate with their email API and send emails that will reach the inbox. Also, it lets you authenticate your domains and offers a dedicated IP address to boost email deliverability.

It’s easy to integrate and use the SendGrid SMTP relay service with WordPress and other platforms. To connect your WordPress site with SendGrid, you can also use the WP Mail SMTP plugin free.

Pricing: Free plan with 40,000 emails for 30 days and 100 emails per day. After that, their paid plans start from $24.95 /month.

5. Amazon SES – Top Free SMTP Service

Amazon SES Scalable SMTP provider

Amazon SES or Amazon Simple Email Service is a highly scalable cloud-based email sending service. It’s a product of the leading cloud computing service company Amazon Web Services.

The Amazon SES comes with a powerful SMTP interface capable of sending tons of emails smoothly. It includes features like content filtering, dedicated IP addresses, and a reputation dashboard to improve your sender reputation.

Hence you can confidently send transactional messages, marketing newsletters, and also receive the incoming emails. Its robust structure ensures that your emails don’t end up in the spam folder.

Pricing: If you’re hosting your site on Amazon EC2, then you can send 62,000 emails/month for free. For other email clients and websites, you need to pay $0.10 every month for 1000 emails.

6. G Suite – A Premium SMTP Service

G Suite Google SMTP Services

G Suite is a package of productivity apps for business by Google. It includes professional email, online storage, calendar, and more for your business.

Using this SMTP provider, you can use Google’s SMTP servers to send emails to your customers. It’s easy to integrate the Gmail SMTP in WordPress with the WP Mail SMTP.

However, it’s suitable only for small businesses because it lets you send only 2000 emails per day.

Pricing: Starts from $6 per user per month.

7. Postmark – Highly Rated SMTP Service


Postmark is among the best SMTP providers you can get your hands on. It offers quick email delivery and easy integration.

One of the features of Postmark is that it specializes in transactional emails. So, this means that you get top-notch security and detailed analytics.

It offers 3 servers in the US, 1 server in Singapore, and 1 server in Amsterdam.

Pricing: Postmark prices start from $10 per month for 10,000 emails.

Connecting SMTP Services to Your WordPress Site

Now that you know the best SMTP services on the market, you may be wondering how to connect an SMTP service with your WordPress site.

If so, then you’re in luck! The best WordPress SMTP plugin WP Mail SMTP makes it effortless to connect your WordPress site with the top SMTP relay services.

WP Mail SMTP Best WordPress SMTP Plugin

WP Mail SMTP is available as a free plugin with easy setup options for Mailgun, SendGrid, Gmail SMTP, and more. There’s also the premium plan with Microsoft SMTP, Amazon SES SMTP support.

Used by more than 1 million websites, WP Mail SMTP is the perfect SMTP solution for WordPress. To learn more, visit the official website and documentation.

We hope this article helped you to find the best SMTP services for email marketing. You may also want to see our guide on how to create a free business email address.

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