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Online Transactional Email Software - Page 3

Last updated: March 2026

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85 software options

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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KingMailer logo

Cloud-based SMTP for email delivery

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KingSMTP is a cloud-based SMTP service for reliable transactional email delivery. Send system alerts, invoices, account notifications, and other critical emails with full logging and tracking. Designed for apps, websites, and SaaS platforms.

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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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Kasplo logo

Set up professional email campaigns that engage your users.

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Through our SMTP configuration create and set up an API key in minutes. Integrate your website and apps fully with our API infrastructure for hassle-free connectivity and optimum performance.

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Userlist logo

Customer engagement platform to send targeted messages

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Userlist is a cloud-based customer engagement platform that enables enterprises to onboard clients and streamline communication by sending behavior-based notifications to a targeted group via emails or text messages.

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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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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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Zulu eDM logo

Campaign management and marketing automation software

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Zulu eDM is a multi-channel campaign management software designed to help franchises schedule, track, and manage email and SMS marketing operations. It allows multi-business firms to create brand-specific templates, operate several team accounts, add location-specific content for engaging local subscribers, and more.

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realcrux logo

Get a personalized dedicated SMTP server with dedicated IPs

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Get a personalized dedicated SMTP server with dedicated IPs designed for your cold email needs.

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Doppler logo

Marketing automation tool with forms, email & SMS campaigns

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Doppler is an email marketing platform designed to help businesses engage with customers using customizable forms, pre-defined templates, personalized communications, and SMS campaigns. Some features include an HTML editor, A/B testing capabilities, real-time reports, a centralized dashboard, and permission management.

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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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360NRS logo

360nrs is a customer messaging platform SMS, Email, WhatsApp

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360nrs is an omnichannel messaging platform that helps businesses create, automate, and manage customer communications across SMS, Email, WhatsApp, and Voice—supporting personalized, scalable campaigns and transactional notifications from a single interface.

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APSIS One logo

Gather data. Automate customer journey. Grow your business.

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APSIS One is an easy-to-use platform for Email, Marketing Automation, SMS, Website Personalisation, E-commerce and more. All you need to improve results, increase retention, and grow your business.

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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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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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SMTP logo

Transactional and Email Relay API

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On-demand scale and unmatched deliverability. Whether it's thousands of emails per month or millions, our customers count on us for timely sending and industry-leading deliverability.

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Zoho ZeptoMail logo

Transactional Email Sending Service

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ZeptoMail is a transactional email sending service.

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Spotler SendPro logo

The Email Engine

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We're everything that happens under the hood of your email communications. Reliable, scalable Email API with endless capabilities & features ready for integration.

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Enabler logo

Enterprise-level email marketing software

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Enabler is an enterprise-level email marketing software which supports email consultancy, email campaign management, and email template design services

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CRM in Cloud logo

Cloud-based software for managing sales and marketing

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CRM in Cloud is a cloud-based customer relationship management software designed for small and medium-sized businesses. It provides a 360-degree view of your business and customer network, allowing you to manage email, leads, marketing activities, and monitoring.

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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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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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Retarus logo

Your Communications Need More Than Just the Best

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Retarus Transactional Email is a solution for enterprise organizations to send emails directly from their business apps.

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Perfect Doc Studio logo

Customer Communication Made Simple with AI

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Our cloud-based platform streamlines multichannel customer communications with user-friendly tools for composing and delivering personalized business messages in 100+ languages. Integrated with popular business software like BPM and CRM, Doc Studio automates customer communications across 6 channels

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