UniOne Email API Alternatives (January 2026)

Transactional Email Service | API Email System - UniOne

UniOne is a transactional email service: you can send Transactional Emails simple and cheap with the help of platform API Email UniOne.

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Transactional Email API Service For Developers | Mailgun

https://www.mailgu

.com/

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

Email Marketing Software. Mail Delivery API | Elastic Email

https://elasticemai

.com/

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!

Transactional Emails Made Easy. API and SMTP Relay Sending.

https://jangosmt

.com/

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

SendPost Transactional Email API & SMTP Relay

https://app.sendpos

.io/

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.

Lightning fast email delivery powered by AI | SMTP & Email API

https://mailaz

.com/

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.

HandySends SendGrid Email API Transactional Email Service

https://www.mailmod

.com/resources/transactional-email-services/handysends-sendgrid-email-api/

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

Transactional email service: Send 10K emails for free | Zoho ZeptoMail

https://www.zoh

.com/zeptomail/

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.

Email Sending Service - MailerSend

https://www.mailersen

.com/

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

SMTPServer: Send Unlimited Emails | Email Delivery Service

https://smtpserve

.com/

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!