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Top Rated Transactional Email Software with Simple mail transfer protocol - Page 2

Last updated: May 2026

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37 software options

Maropost logo

Omnichannel campaigns that get results

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Maropost empowers businesses to scale and boost revenue with an easy-to-use marketing automation solution that enables users to hyper-segment their audience and rapidly create marketing campaigns that distinguish them from the competition.

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Inxmail logo

Email marketing software to create newsletters & emails

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Inxmail is the service-oriented tech specialist for secure, data-driven communication in email marketing.

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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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Mailjet logo

Marketing Email, Transactional Email, Transactional SMS

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With GDPR-compliant infrastructure and proven deliverability, Mailjet is the best Email Marketing Software & Email API for Teams. Marketers design, deliver, and automate email newsletter while developers power transactional email via robust API platform.

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GetResponse logo

Convert more customers. Keep them coming back.

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An email marketing tool that helps business owners build permission-based mailing lists, maximize conversions with email automation and responsive design and create a landing page. GetResponse features include video email marketing, email-to-speech, and a custom form builder.

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SendGrid logo

Delivers reliable email at scale for businesses

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SendGrid is a solution that provides a cloud-based email infrastructure to help relieve businesses of the cost and complexity of maintaining custom email systems. It provides email delivery, scalability and real-time analytics along with APIs. The platform also offers SMTP service, email validation, deliverability insights, and dynamic templates, while supporting multiple programming languages including Node.js, Python, and Java.

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Campaigner logo

Powerful Email Marketing & Automation platform

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Advanced yet easy-to-use email marketing platform featuring automation workflows, contact segmentation, multivariate experiments and A/B split testing, drag & drop and HTML email editors, pre-built templates. conversion tracking and real time reporting.

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MailerLogic logo
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MailerLogic – Email API, SMTP & CRM Automation

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MailerLogic is an all-in-one email platform offering Email API, SMTP relay, CRM automation, and deliverability intelligence to help businesses improve communication, engagement, and inbox placement.

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Maileroo logo

Email delivery made simple & straightforward

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Maileroo provides fast, reliable SMTP Relay and email marketing. Personalize campaigns, track performance in real time, and optimize deliverability for better results. With advanced tools and analytics, you can ensure your emails reach the inbox, driving engagement and success.

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Lettr logo
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Cloud-based transactional email API for artisans

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Lettr is a transactional email platform with HTTP API + SMTP relay, real-time webhooks, analytics, and a visual template editor with version history and a draft/publish workflow for teams.

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Pingram logo
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Simple APIs for email, SMS, AI voice, and WhatsApp.

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Pingram (formerly NotificationAPI) is a communications API for email, SMS, voice, and WhatsApp. Built-in infrastructure, A2P 10DLC, and voice AI let developers ship faster with a single, simple API.

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