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Top Rated Transactional Email Software with Simple Mail Transfer Protocol (SMTP)

Last updated: April 2026

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35 software options

Mailgun logo

Mailgun

Transactional email API service for developers

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Mailgun is an email automation service offering a complete cloud-based email service for sending, receiving & tracking email sent through your websites & apps

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SendPost logo

Cloud-based email verification platform.

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SendPost provides an Email API and SMTP relay for developers, software businesses, and ESPs with tools, expertise, and support needed to reliably deliver, measure and optimize transactional emails.

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Dyspatch logo

Create beautiful, customized email templates without code.

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Dyspatch is an email production platform that helps email teams of all sizes create customized emails templates without needing to code.

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Mailsoftly logo

Send personalized emails and get higher response rates!

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Send important emails—like receipts, alerts, and password resets—fast, reliably, and without headaches.

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EmailDelivery.com logo

Self-hosted email marketing for enterprise & small business.

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EmailDelivery.com is a self-hosted email marketing platform that comes with a proprietary MTA included for sending over your own IP addresses, and also supports SMTP Relay and APIs such as Amazon SES, Mailgun, and Sparkpost.

White label ready for agencies & resellers

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SMTP2GO logo

Fast, reliable mail delivery and management solution

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SMTP2GO is a cloud-based email management solution which helps businesses track emails and generate visual reports. Key features include data management, email monitoring, blacklisting, email authentication, and an API.

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Mailtrap logo

Email delivery for fast-growing products that send at scale.

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Email delivery platform for fast-growing product companies.

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Magileads logo

Business starts her

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Magileads is an automated sales prospecting & lead generation tool, designed to help sales teams protect & retain leads & transform new prospects into customers. Features include automated emails, reports and analytics, points scoring, prospect targeting, behavioral statistics & CRM integration.

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Ongage logo

An email marketing platform for high-volume email operations

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The Ongage email marketing platform offers capabilities that include email API and everything you need to manage transactional emails at scale. Features include a full analytical suite, advanced segmentation, dynamic personalization, data-driven campaigns management, next-gen SMTP relay, and more.

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UniOne logo

Friendly Email API and SMTP service

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Take care of your transactional and marketing emails in an easy and automated way. Connect your web or app to UniOne via API or SMTP.

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Postmark logo

Cloud-based email management software

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Postmark is a cloud-based email management software designed to help businesses handle and streamline the delivery of emails. Supervisors can create transactional emails using customizable templates, track open click rates, and automatically receive notifications about invoice bounces.

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Getsitecontrol logo

Emails | Popups | Automations

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Getsitecontrol is an email marketing platform for small and medium-sized ecommerce brands.

It brings a complete email marketing toolset with a powerful popup builder on board. Generate leads and segment your audience, send professional newsletters, build email marketing automations.

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Enginemailer logo

Cloud-based email marketing and campaign management system

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Enginemailer is a cloud platform for email marketing, transactional emails, and automation – built with AI tools, analytics, and secure integrations.

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Mailazy logo

Cloud-based transactional email service provider

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Mailazy is a powerful transactional email system built for developers based on SMTP and API to ensure inbox delivery of your emails. It quickly integrates and delivers your emails to customers’ inboxes with global infrastructure and industry expertise you can rely on.

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Postman SMTP logo

Making Email Deliverability for WordPress.

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If you want to be sure that your emails are always delivered successfully, then you need Post SMTP. This powerful SMTP Mailing Plugin is the best solution for maximizing email deliverability, with full compatibility with any SMTP mailing service and API mailing.

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Maileon logo

Newsletter & marketing automation software

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Maileon is an email marketing and automation solution that allows you to send targeted email campaigns to your customers and develop marketing automations. Benefit from numerous powerful features such as personalized sending times, our recommendation engine, AMP mailing support, landing page editors

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rapidmail logo

Send your newsletters with rapidmail newsletter software

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Create a newsletter easily: rapidmail is designed for simple and intuitive operation. We want you to create your newsletter fast and without any complications. Use our editor to create your email newsletter.

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Brevo logo

Automation, marketing & transactional email, and SMS service

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Brevo is a CRM and email marketing solution that helps businesses run multi-channel marketing campaigns across email, WhatsApp, SMS, web push, and Facebook ads. Teams can trigger transactional emails, SMS, and WhatsApp notifications over Brevo SMTP and APIs.

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Acumbamail logo

Cloud-based tool for email and SMS marketing campaigns

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Acumbamail is a complete tool with Email Marketing, SMS campaigns, and landing pages for companies of all kinds to effectively communicate with their customers between channels, expand their business and improve their conversion rates.

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Selligent logo

Multi-channel marketing solution fusing insight & engagement

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Selligent is a multi-channel marketing solution for identifying customers, analyzing behavior across channels, and interpreting data with custom reports

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SendPulse logo

Email, web push, SMS, chatbots, CRM on one platform

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SendPulse is an all-in-one marketing and sales automation platform for marketers, business owners, industry experts, and eLearning businesses. Our ecosystem includes 10+ audience engagement, communication, and lead generation services and offers an extensive free plan.

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Mailmodo logo

Email marketing software with templates and AMP emails

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Mailmodo, a new-age email marketing tool, helps you get higher email conversions by adding interactive app-like elements inside emails.

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Mailchimp logo

Email and SMS marketing automation platform

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Mailchimp is an email and SMS marketing platform that combines artificial intelligence with marketing automation capabilities. The platform features a drag-and-drop builder, content creation tools, and audience management functions to help businesses design and distribute marketing campaigns across multiple channels.

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MailerSend logo

Transactional messaging service built for the whole team

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MailerSend is a transactional messaging service that enables developers to work faster and smarter.

An advanced sending infrastructure and flexible payment plans let you scale your sendings, plus Premium plans include dedicated IP, sender identities and 24/7 support for a comprehensive solution.

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Constant Contact logo

Streamlines marketing to grow loyal audiences

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Constant Contact is a digital and email marketing platform that provides tools for creating, sending, and tracking email campaigns. The platform offers customizable email templates, AI writing assistance, and automation features to help businesses reach audience. Additionally, it includes social media marketing capabilities, SMS marketing, and multi-account solutions for organizations managing multiple locations or teams.

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