5 Top SMTP Relay Software That Can Take Your Business To The Next Level

Are you searching for the best SMTP mail relay service for your business? Tired of getting your emails delivered to the junk folder? Want to take your email campaign to the next level?

If your answer is yes, read on. Let’s look at some of the popular SMTP mail relay services available and how to choose the best SMTP relay software that will fulfill your email marketing requirements.

Best SMTP Relay Service Providers


When it comes to email marketing, Sendinblue is one of the best SMTP relay software in the market. It comes packed with an innovative and robust marketing platform that allows small and medium businesses to carry out their email marketing campaigns efficiently. The Sendinblue SMTP server is equipped with a lot of features that include email marketing, SMS marketing, powerful analytics, live chat support, etc.

They offer both paid and free versions that enable a small business to send 300 emails per day for free. The paid version allows businesses to send unlimited emails any day, but within the monthly cap of 40,000 emails, and the plan starts from $25 a month.

SendinBlue is extremely simple to integrate with various applications like WordPress, Joomla, and Shopify. It also comes with a detailed manual to allow businesses to integrate other third-party tools such as Google Analytics and Salesforce to enhance their marketing strategy.

Sendinblue Highlights:

  • Power-packed personalization capabilities.
  • Flexible API.
  • 300 free emails per day forever for free users.
  • Marketing automation options available like scheduling.


Mailgun is a popular SMTP service provider for developers and businesses. They offer powerful APIs to send transactional emails. Whether you run a small or medium business, Mailgun gives you the capability to send bulk emails for marketing, education, promotions, and transactional purposes.

The SMTP software is scalable and is specially designed to be used by developers. Hence, people with minimum or no technical skills may find it hard to use this email relay service. So, if you are a beginner, then Mailgun is not the one you must be using as you won’t find any beginner level features to start with.

Users can also easily integrate the service with WordPress, Joomla, Shopify, etc. With Mailgun, the first 10,000 emails are offered free for its customers. Businesses that need to send more than this limit will need to switch over to their “Pay as you go” plans, but the free plan is enough for small businesses having less than 10,000 customers. With just $79/month, Mailgun offers enterprises with a dedicated IP address and enhanced email deliverability.

Mailgun Highlights:

  • Email validation features.
  • Easy to create mailing lists.
  • RESTful API integration.
  • Searchable logs.
  • Incoming email routing.


SendGrid is a cloud-based SMTP relay service that has over 78,000 customers worldwide and is being used by Uber, Airbnb, and Spotify. SendGrid is renowned for its transactional email features.

One of the highlights of this SMTP service is that it is neither expensive nor cheap and makes it the ideal choice for businesses to enhance their email marketing campaigns.

Another significant reason that makes this SMTP email relay service highly recommended by businesses is because of its excellent 24×7 customer support, extensive analytics, and reports. SendGrid is also very easy to integrate and comes with a simple API, as well. SendGrid is also famous for its higher delivery rates as well.

Sendgrid Highlights:

  • Mailing list management.
  • 24/7 support.
  • Easy to set up.
  • Detailed reporting/analytics.
  • WYSIWYG Email Editor.

Amazon SES

Amazon Simple Email Service or Amazon SES is one of the leading SMTP relay services available in the market. However, Amazon SES is not that suitable for beginners as the interface is a bit cumbersome. The API is also slightly perplexing to interpret, but the prices are too low, and you can send around 1000 emails for as little as $0.10. However, you can get around the difficulty with the interface by making use of third-party tools like Sendy to send your marketing and promotional emails.

Amazon SES Highlights:

  • Cheap SMTP service.
  • Reliable and trusted service.
  • Dedicated IP address.
  • Verified database.
  • Detailed reporting/analytics.
  • API integration capabilities.

Google SMTP Server

If you are looking for a free SMTP relay software, then look nowhere other than Google SMTP service. It is one of the best open relay mail service providers available on the market and used by thousands of small and medium businesses globally.

With Google free SMTP gateway, businesses can take their email marketing to the next level. One of the main reasons that organizations opt for Google SMTP is because it is well established and comes with a high reputation as well. Google SMTP server is extremely easy to integrate with many platforms and scripts.

Google SMTP Server – Highlights:

  • Access to photos/videos and files on Google Drive.
  • Access to other Google Services.
  • Easy to integrate with WordPress.
  • Comprehensive analytics.


No one size fits all when it comes to SMTP servers, and hence it is up to you to choose the right SMTP service that meets your budget and marketing requirements. Hope the above list provides you with all the information you need on SMTP relay software. You may now weigh the options and decide the best email relay service suitable for your business requirements.