Transactional Email Software

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SMTP2GO is a dedicated outbound email serverSMTP2GO is a New Zealand based SMTP/Email API provider with support staff and servers based across the globe. It automatically connects to the closest server to ensure speedy and efficient delivery.The SMTP2GO support team offers 24/7 assistance…


Brevo, formerly known as Sendinblue, is the leading customer relationship management (CRM) suite designed to fully cultivate long-term customer relationships and to empower businesses to expand in a fast changing digital world. With Brevo, businesses have a unified view of the customer…

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Brevo, formerly known as Sendinblue, is the leading customer relationship management (CRM) suite designed to fully cultivate long-term customer relationships and to empower businesses to expand in a fast changing digital world. With Brevo, businesses have a unified view of the customer…


SMTP2GO is a dedicated outbound email serverSMTP2GO is a New Zealand based SMTP/Email API provider with support staff and servers based across the globe. It automatically connects to the closest server to ensure speedy and efficient delivery.The SMTP2GO support team offers 24/7 assistance…

Twilio SendGrid

Twilio SendGrid Marketing Campaigns provides users with segmentation, campaign editing, and deliverability. According to the vendor, Twilio SendGrid Marketing Campaigns is trusted by over 80,000 customers globally, including Airbnb, Spotify and Uber. Twilio SendGrid Marketing Campaigns…

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Sinch Mailgun

Mailgun is a transactional email API service which was owned and supported by Rackspace (acquired in 2012) and then spun off in 2017 as an independent and standalone entity. It is now supported by Sinch since that company's acquisition of Mailgun and Mailjet, through acquiring Pathwire.…

Campaign Monitor by Marigold

Campaign Monitor by Marigold enables users to create, send, and optimize email marketing campaigns.

Amazon Simple Email Service (SES)

Amazon Simple Email Service (Amazon SES) is an outbound-only email-sending service useful for marketing and transactional email, relying on the infrastructure of Amazon. Amazon SES provides the requisite statistics and built-in notifications for bounces, complaints, and deliveries…


Mailjet is an email solution designed for both marketers and developers. Mailjet allows them to create, send, and track marketing and transactional emails via a user interface or APIs. EMAIL MARKETINGMailjet’s user interface is available in 5 languages (English, French, German, Spanish,…

Mailchimp Transactional Email (Mandrill)

Mailchimp Transactional Email (formerly Mandrill) is designed to allow users to deliver fast, personalized transactional emails using API or SMTP.


SendPulse is an integrated messaging platform providing user communication that includes emails, SMS, web push, SMTP, and user management.. This solution includes 15,000 free emails with up to 2,500 subscribers per month.


Postmark from Wildbit in Philadelphia sends and tracks transactional emails.


ClickSend aims to help businesses communicate with their customers and staff in the moments that matter on the channels, they use every day.ClickSend is designed to power billions of messages worldwide and offers a full suite of communications products from SMS and rich messaging…

Oracle Dyn Email

The Oracle Dyn Email Delivery service is an email delivery infrastructure which supports sending via an API or SMTP, and is built to reliably support bulk and transactional emails. The service also includes sender reputation management (via its RepMan service), send monitoring and…


Sendwithus is a communications platform built around advanced email content management. The platform aims to simplify email creation with a robust API, an intuitive visual editor, and built-in device testing, allowing for collaborative email strategy and execution. The cloud-based…

Vonage Communications APIs

Vonage APIs (formerly Nexmo and TokBox) help growing startups and agile enterprises enhance customer experience and realize new business outcomes at scale. With a comprehensive suite of communication channels, a global platform, and expert support, users can abstract the complexity…

Elastic Email

Elastic Email is an email delivery service for transactional emailing.

Netcore Email API

Netcore Email API (formerly Pepipost) is a transactional email service from the Indian company Netcore Cloud.


The flexEngage, now from Klarna, is a digital receipt solution that helps brands to increase brand loyalty, start the next purchase and create a seamless experience for users and their customers. With flexEngage's network of integrations, digital receipts can include loyalty incentives,…


UniSender is a simple solution for Email campaigns. This is an all-in-one marketing platform for personalized Email, SMS campaigns, and lead generation. The vendor promises that UniSender offers the following: Emails in mobile format. It has 100+ ready-to-use templates ideally…

SMTP Email Relay Solutions

SMTP Email Relay Solutions is a transactional email service formerly from SharpSpring and now a J2 Global company.


MailUp is the eponymous email & SMS platform from the Italian company that was founded in 2002 that now has a modest but respectable presence across the western world with a diverse customer base (Yamaha, Amnesty International, Korean Air, etc.). Mailup's platform combines email…


Mailtrap is an Email Delivery Platform where dev teams can test, send, and control email performance. Mailtrap provides email infrastructure to ensure high deliverability rates and reduced need for maintenance. Its Email Testing is used to inspect and debug emails. Catch testing…

Critical Impact

Critical Impact enhances and simplifies email marketing campaigns with tools used to manage email and SMS lists, send personalized and automated emails, along with text messages (SMS) for marketing campaigns. Its subscriber scoring algorithms will mine the user's data to identify…

UniOne Email API

UniOne is created to let users send vast amounts of emails through API/SMTP at speed, boasting high deliverability and caring support. Designed for developers and marketers, UniOne deals with all transactional, trigger, and promo emails when integrated into CMS, CRM, CDP, or any…

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WowSender helps users build an email marketing strategy online to foster relationships with customers and prospects through targeted, personalized messages. The vendor states its mission is to help small and medium-sized businesses succeed with their email campaigns. WowSender helps…

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EmailGreen is a web-based application that enables business owners to organize their contacts in the EmailGreen CRM, create customized email marketing campaigns, incorporate mobile marketing into their strategy, engage in social media, and much more using the EmailGreen platform.…

Learn More About Transactional Email Software

What is Transactional Email Software?

Transactional email software allows users to send one-to-one personalized emails based on trigger events that occur in the user's app or on their website. At the heart of these products is an API used to configure and detect the trigger events. Often the email builder and analytics offered in transactional email tools are fairly basic. Examples of events or actions that trigger transactional emails include:

  • Welcome letters

  • Order and shipping confirmations

  • E-receipts or invoices

  • Password reset

  • Free trial expiration alerts

  • Notifications and alerts

Some email marketing and marketing automation providers offer transactional email capabilities in addition to campaign-based functionality. There is also some overlap between transactional email tools and mobile marketing products that send transactional SMS messages, or transactional email messages triggered by activity within a mobile app (like a welcome email for new users sent upon creating an account in the app).

Transnational Email Features

All transactional email tools will have some form of email APIs, SMTP relay, and/or webhooks available. Other common features across transactional email software include:

  • Dedicated IPs

  • Suppression management

  • Inbound email routing

  • Email previewing

  • Email tracking

  • Email address validation

  • Email log retention

  • Email delivery optimization tools

  • Drag-and-drop email editor

  • Transactional email templates

Transactional Email Software Comparison

Before deciding to invest in either an email marketing platform or transactional email tool, consider the following key factors:

  • Type of emails: What type of emails will you be sending? Only transactional emails, or other types of campaign-based emails too? If it’s the latter, then you’ll likely need email marketing or marketing automation software as well. Some email marketing and marketing automation platforms include transactional email capabilities.

  • Number of emails: What volume of emails are you planning on sending? How large is your audience or contact database?

  • Integrations: Does the transactional email or email marketing product integrate with the other marketing software you use? Make sure to check that the product you end up purchasing has all the integrations you need.

Free Transactional Email Software

Many transactional email vendors offer a free version of their paid product. Some examples of vendors that offer free transactional email software or API include:

However, these free transactional email options often have limited functionality when compared with paid options. For example, there is usually a monthly or total limit to the number of emails that can be sent using the free product. This can range from 100 emails a month to a few thousand a month, or 10,000+ total free emails.

Pricing Information

Most paid transactional email platforms charge per month per number of emails. For basic plans, pricing can start as low as $7/mo. for up to 25K emails. Advanced plans with more features, such as audience segmentation and email A/B testing, start closer to $20/mo. for between 25K and 30K emails. Most paid plans charge over $100/mo. for email volumes upwards of 300K.

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Frequently Asked Questions

What do transactional email tools do?

Transactional email software allows businesses to send their users or subscribers automated emails triggered by events or actions the user takes. For example, an automated welcome email after a new user signs up is a transactional email. Password reset, order confirmation, and e-receipt emails are other examples of triggered transactional emails.

These types of tools typically include email APIs businesses can use to configure event triggers. Some tools also include more advanced features, such as contact management, audience segmentation, email A/B testing, and email templates.

What are the benefits of using transactional email software?

The primary benefit of using a transactional email platform is the amount of time and manual effort saved. Especially in the ecommerce industry, companies can receive thousands of new subscribers or orders per day. Both of these actions typically require a follow-up or confirmation email to be sent out.

Sending out potentially thousands of emails per day or week would take countless hours. Thus the biggest benefit this type of software provides is the automation of sending triggered emails.

What is the best transactional email software?

According to end-user feedback on TrustRadius, some of the most popular transactional email products (based on the number of reviews they have) include:

How much does transactional email software cost?

There are several free transactional email tools, though they typically have limited functionality. Many free options limit the number of emails users can send per month or in total as well. Examples of free transactional email tools include:

Paid tools can cost as little as $7 per month for about $25K emails. Plans with more advanced features tend to start at about $20 per month for between 25K - 30K emails. The cost for transactional email software can increase up to multiple hundreds of dollars per month for 300K or more emails.