UniOne Email API Alternatives (September 2025)

JangoSMTP - Transactional Emails Made Easy. Highest Inbox Results. Live US-Based Support. API and SMTP Relay Sending.

Elastic Email is a marketing platform, built on the most cost-effective delivery engine. Join tens of thousands of companies, which already send their emails!

Email API and SMTP relay to not just send and measure email sending, but also alert and optimise. We provide you with tools, expertise and support needed to reliably deliver emails to your customers inboxes on time, every time.

Powerful Transactional Email APIs that enable you to send, receive, and track emails, built with developers in mind. Learn more today!

Integrate in minutes and send transactional emails via our REST API or SMTP. Scale with our reliable global infrastructure and deliver emails to your customer's inbox instantly.

Send bulk, transactional, & marketing emails with our easy-to-use and reliable SMTP. Check the quality of email and improve delivery. Get started for free!

Start sending emails with our top-rated service. Sign up for free now to streamline your email sending process with API or SMTP.

This reliable and secure transactional email service by Zoho Mail ensures guaranteed and fast delivery of transactional emails, and comes with a pay-as-you-go pricing plan.

Learn how to use Mailchimp Transactional Email to send targeted and event driven messages to anyone, fast—with best-in-class deliverability.

Discover AhaSend, the Email Service Provider dedicated to revolutionizing transactional emails. Enjoy hassle-free pricing at $0.50 per 1,000 emails and experience unmatched delivery times. No hidden fees, no brackets, just straightforward service designed for your peace of mind.

Niezawodne Email API i SMTP w chmurze. Najwyższa dostarczalność i szczegółowa analityka wiadomości email wysyłanych z Twojego systemu lub aplikacji.

Email Delivery Platform to test, send and control email infrastructure in one place. Great for dev teams. Start today - Sign Up free!

Streamline your emailing and boost your sales with Mailjet. We serve all your email and SMS needs with one simple and powerful service.

Explore HandySends SendGrid Email API transactional email service! Discover its features, pros, and cons to send transactional emails.

Send Transactional and Promotional Emails in bulk using SendClean. Best Email Marketing and Email API Solution for Enterprises. White lable Email Solution.

Send your Transactional and marketing Emails safely, track your results and use powerful APIs designed for devolopers by developers. Try for free

SMTP email relay service that is powerful, secured and reliable. Send better transactional emails and integrate easily with our email API.

Email delivery, perfected with Mailtinni! 💌 Your new SMTP service: fast, reliable, highly secure. 🚀

Simple and powerful email verification JSON API using SMTP, typo checks, syntax validation, and free and disposable provider filtering. Free for personal use.

SMTP2GO is the scalable, reliable email deliverability solution. Worldwide servers, a robust API, and powerful reporting set us apart. Try our free plan!

Everything you need for more successful email delivery and performance management, from simple sending tools to deeply informative reporting.

Trigger thousands of messages in minutes. Integrate seamlessly. Only pay for what you need. Try Brevo's Messaging API for free — no credit card needed.

Explore AuthMailer transactional email service! Discover its features, pros, and cons to send transactional emails.

Integrate seamlessly with Netcore's Email API for scalability, high deliverability, & real-time analytics. Designed for developers.

Use Mailmodo to create and send interactive emails your customers love. Drive conversions and get better email ROI. Sign up for a free trial now.

Whether you need to attract new customers with your next hot promotion or reliably communicate with your existing customers, Mailrelay is your best choice.

The Most Comprehensive Email Verification Service from only $59: Email Checker, Email List Verify, Bulk Email Verifier, ESP Integrations, and Automatic Email Verification

Free real-time email verification service. Easy to use. Start using in 30 seconds

With the Gamalogic Email validation API tool, you can clean your email list and lower your bounce rate during email campaigns. Try it for free today!

Mailosaur removes the frustration of testing everything a user might do. 
Test password resets, replies, two-factor logins, and more.

Buy SMTP service. 99% Inbox. Free to test. Best price/quality SMTP offer. Buy with Bitcoin. Send, receive, route/forward emails.

MailboxValidator email validation clean email lists and reduces bounce. It connects to the mail server and checks whether the mailbox exists or not.

Start sending transactional and marketing email in minutes. Easily scale to enterprise-volume with Twilio SendGrid’s Email API. Try it free!

Rock-solid reputation and a reliable API with endless possibilities for sending your transactional emails.

Boost your email deliverability and engagement with Inboxroad. Our comprehensive solutions and expert guidance ensure your messages reach the inbox - Inboxroad

Send professional bulk emails in no time with Selzy email marketing service. Track statistics. Conduct A/B-tests. Automate campaigns. 1500 emails free.

Incoming Email for your Web Application, send and receive email via HTTP Post in the Cloud

Mailercloud is the ultimate platform for growing businesses, offering smart and intuitive email marketing tool to help you thrive in the digital world.

Bulk email verifier. Get rid of spam traps, bounces,and disposable emails. Start with 100 FREE email validations! Secure & accurate bulk email validation

Launch Your Own Email Service Provider and Email Marketing Agency. Sell it to your customers and clients, or use it in-house.

Advance your app's capabilities: Integrate LinkedIn and WhatsApp for streamlined messaging and improved user experience.

Create your own marketing strategy Send in seconds Send & analyze email marketing campaigns. Start your free plan with unlimited credit. Free for a lifetime! Sign up for free See pricing INBOX is an email marketing tool with more powerful features and flexibility than any other Easy To Use Create a campaign in | Create email marketing your subscribers will admire INBOX

Courier is a notification API built for developers. Design once, and deliver to any channel – email, Slack, SMS, push, and more – all through a single API.

Grow your business with Brevo, the all-in-one platform to manage customer relationships across email, SMS, chat, and more. Get started for free.

Ecommerce email marketing, automated emails and SMS - switch to Omnisend and increase your sales without increasing your workload.

Bouncify is a Leading provider of bulk email list cleaning and email verification service. Run our bulk email verification tool through your list of emails to remove hard bounces and keep your mailing list clean and engaged with 99% accuracy. We provide email list validation to marketers from all countries.

Unlayer is an email editor and page builder to build beautiful, responsive designs quickly and easily. Use it online or embed it into your application.

Test new user signups, transactional emails, spam scores, and more. Get started on our free forever plan with unlimited email addresses and mailboxes.

Improve domain reputation and increase the quality of your mailing list by validating emails before sending a campaign, or at the point of capture.

Optimize your email strategy with ZeroBounce. We offer top-tier email validation, list cleaning, and address verification to reduce spam traps and enhance deliverability.

Email Address Validation and Email List Cleaning Service reduces bounce rates. Quick Email Verification Service is the right platform to verify email list and improve deliverability.

Newsletter software for people like you.

Improve your email deliverability with Bouncer's robust email verification and deliverability platform. 🌐

Turn data insight into personalized, cross-channel marketing experiences with Dotdigital's all-in-one customer experience and data platform.

MailUp is your complete email and SMS delivery solution that combines powerful email marketing tools with SMTP relay and plugins for e-commerce, CRM, and CMS systems

Magnetic Mailer is one of the Best AWS SES Email Sending Software available in the market. You can also use SendGrid API, Elastice Mail API and SMTP Settings.

Litmus is the all-in-one email marketing platform that provides the tools and solutions your team needs to make every send count. Try for free today!

Build beautiful, responsive emails with Benchmark's email marketing platform to engage subscribers, nurture leads, and track results.

Over 31,000 companies from 20 countries worldwide are already using KIRIM.EMAIL as their email infrastructure to generate more sales, build apps, and build

Explore PreviewMyEmail email testing tool! Discover its features, pros, and cons to analyze email better.

Verify your email list in minutes, or integrate real-time email verification into your app with our API. Over 18 billion emails verified. Get started for free.

Mailcheck is an easy-to-use, fast, and efficient email validation tool with an API integration feature for on-the-go validation.

Random email address and phone number generators. Use SMS and email in otp tests, 2fa verification, and marketing.

Send more, spend less. Send emails 100x cheaper with Up, the #1 email marketing tool powered by Amazon SES.

Improve your email sender reputation and reduce bounce rates: real-time email validation API and bulk email list cleaning. Free trial & 100% accuracy.

Loops makes email marketing for modern SaaS companies easy. It's the best way to create, send and track beautiful email campaigns.

The ultimate email marketing software and marketing automation platform that will not break your bank. Try Moosend for free!

Speed up email creation with Beefree's drag-and-drop, no-code HTML email builder and editor. Compatible with your favorite sending platform. Sign up for free!

Flodesk makes simple, intuitive software tools to help you grow your business. Try it free for 30 days—no credit card required.

Un Servicio de Email Transaccional garantiza la llegada de los emails a tus clientes. Envia adjuntos con el Servicio de Email Transaccional con Doppler Relay.

Integrate email, calendar, contacts & tasks painlessly with Aurinko. Free trial, trusted by leading companies.

Explore Zender transactional email service! Discover its features, pros, and cons to send transactional emails.

Email Validation and Verification, Email Checker and Bulk Verify Tool. Using DeBounce remove invalid, disposable, spam-trap, syntax and deactivated emails.

Get rid of spam traps, bounces, disposable or catch-all emails with bulk email verifier or real-time API. Start with 100 FREE email verifications!

Email marketing tool, bulk SMS sending and creation of landing pages

Manage and email your subscribers for far cheaper with EmailOctopus. Drag and drop email builder, powerful analytics, bounce/complaint tracking and more.

The powerful email verification tool helps you validate and clean your email list seamlessly, ensuring verified email subscribers and high deliverability.

We help e-commerce sites recover abandoned shopping carts with an easy, inexpensive email reminder solution that integrates with any website.

Unlock meaningful conversations across the customer journey with programmable SMS, voice, email, video, & verification APIs!

Create emails with ease using Dyspatch's email builder software. Our interactive email builder helps you design emails for any purpose.

Amazon Simple Email Service (SES) is a cost-effective, flexible, and scalable email service provider that allows developers to send email from within any application.

Unlock the power of your communications data. The Nylas communication APIs remove complexity & empower teams to create seamless user experiences.

Sell more w/ a bulk SMS service, email marketing, TTS, 2FA, voice calls & messaging apps integration w/ advanced API communication platform.

​​Multi-channel marketing automation platform with email, web push, SMS, and chatbots for Facebook, Telegram, WhatsApp, and Instagram — all combined in a free CRM.

Power your applications with real-time payment data. Build innovative card-linking applications by connecting Visa, Mastercard and Amex cards to loyalty and marketing services all in one place.

EmailSuccess is a reliable, fast and secure Mail Transfer Agent capable of delivering huge volumes of emails to the biggest email service providers.

Access our top-tier SMS gateway services at an affordable price globally. No subscriptions and full compliance. Create a free account >>

Ensure deliverability and inbox placement for your transactional emails with Oracle Cloud Infrastructure Email Delivery, based on Dyn's Email Delivery technology.

Systeme.io has all the tools you need to grow your online business. Click here to create your FREE account!

AiSensy is the Smartest WhatsApp Engagement Platform based on official WhatsApp Business APIs. Broadcast offers, automate notifications & solve for support.

Fast, secure, and sustainable email services provided by email professionals. Powerful Email and Domain Hosting for businesses and organizations.

Accurate real-time email validation service: upload and clean your list or integrate email verification into your app with our API. Get started for FREE!

CampaignHQ is a multi channel marketing automation platform that helps you to send emails, WhatsApp messages.

Mobile Text Alerts allows you to send mass texts to your customers & employees with no hassle. Get started for free & create your text alert system in seconds.

Improve domain reputation and increase the quality of your mailing list by validating emails before sending a campaign, or at the point of capture.

Take back control of your email with this easy-to-deploy mail server in a box.

Connect with customers on their preferred channels—anywhere in the world. Quickly integrate powerful communication APIs to start building solutions for SMS and WhatsApp messaging, voice, and email.

Engage your customers and prospects with simple drag and drop email, SMS, chatbot or build custom solutions with the best in class APIs

Engage your customers and prospects with simple drag and drop email, SMS, chatbot or build custom solutions with the best in class APIs