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Transactional Email Software with Unsubscribe Database (2026)

Last updated: April 2026

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31 software options

Mailchimp logo
Category Leaders

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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Brevo logo
Category Leaders

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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Constant Contact logo
Category Leaders

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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Omnisend logo
Category Leaders

Drives revenue via automated eCommerce marketing

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Trusted by 150k+ ecommerce businesses, Omnisend’s all-in-one email marketing & SMS tool automates your marketing across the entire customer journey. Build customer relationships & drive sales on autopilot. 1-click integrations with Shopify, BigCommerce, WooCommerce, Wix & more.

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SendGrid logo
Category Leaders

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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SMTP2GO logo
Category Leaders

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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Mailjet logo
Category Leaders

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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Emma by Marigold logo

Multi-channel marketing that works for you.

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Emma by Marigold is an email marketing platform which focuses on segmentation, automation, and an easy-to-use email builder for teams of all sizes to leverage their customer data, increase engagement, and drive more revenue from email. Users can create and collaborate on email campaign content.

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MailUp logo

Email, SMS and Messaging Apps marketing solution

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MailUp is an email and SMS delivery solution. The software allows users to send and design their own promotional, newsletters, transactional emails and SMS, and features database management, email and SMS automation, landing page management, API and integrations, 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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ClickSend logo

Business Communications. Solved

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ClickSend is designed to help businesses send and receive SMS, MMS, voice, email, direct mail, and more within a single platform. Whether it is an SMS blast via the dashboards or automated texts via API, it lets users choose a global SMS gateway and get access to a full communications suite.

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MailerSend logo
Category Leaders

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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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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Mailmodo logo
Category Leaders

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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TextBetter logo

Telephone marketing and landline texting software

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TextBetter is a telephone marketing solution that helps businesses pair landline numbers with email addresses to send or receive text messages. The software allows managers to schedule customizable automated responses, send appointment reminders, and archive messages on a unified dashboard.

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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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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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AIO logo

Omnichannel marketing and digital communication software

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AIO is an on-premise and cloud-based omnichannel marketing software that helps businesses of all sizes manage digital campaigns and streamline client communication through emails, SMS and more.

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ROUTEE logo

Unified communications & transactional emails

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Routee is an email platform, SMTP & email API, based on the chain of responsibility first to make sure your transactional email always reaches its destination. Unlimited contacts without monthly subscriptions. Get access to all of the PRO email features from your first email & forever free of charge

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SparkPost logo

Predictive email intelligence solution with analytics

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SparkPost is an email analytics solution designed to help businesses optimize email performance, deliverability, engagement, and more. It offers predictive intelligence, which allows marketers to gain insights into campaign health, engagement rate, and spam links to diagnose performance issues.

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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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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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Users also considered
Custobar logo

Marketing automation and customer data management software

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Custobar is a cloud-based marketing automation platform designed to help businesses of all sizes create, launch, and manage marketing campaigns. The platform enables organizations to gather and store data about sales, marketing, communication, and customer services from multiple sources on a unified portal for future reference.

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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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Sailthru logo

Marketing automation for media & publishing and retail.

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Sailthru by Zeta is a marketing automation software and multi-channel personalization tool that serves media and retail brands. The software allows you to personalize customer experiences on every channel, including email, website, and mobile.

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