Twilio SendGrid Email API Alternatives (September 2025)

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.

Marketing Campaigns makes it easy to design, test, optimize and scale email campaigns. Reach the inbox with Twilio SendGrid. Try it free!

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

Validate users across SMS and preferred channels at scale with the Twilio Verify API, a turnkey, passwordless authentication solution that enables seamless and secure user onboarding, reduces fraud, and optimizes delivery rates without the heavy lifting. Twilio handles all your connectivity, channels, OTP generation, and more—so you don’t have to.

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.

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

Plivo’s SMS API and Voice API platform enables businesses to communicate with their customers on a global scale. Sign up for free now.

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

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

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

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.

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!

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

Vonage APIs (formerly Nexmo) offers communications APIs, a global platform and expert support—empowering you to create exceptional customer experiences.

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

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

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

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

Communications API for chat, AI chatbots, SMS, WhatsApp, voice, video, KakaoTalk, and in-app notifications with Sendbird's all-in-one communications API platform.

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

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

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.

Ensure communication with customers and suppliers, modernize messaging infrastructures and automate manual business processes thanks to Retarus’ intelligent cloud solutions.

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

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

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.

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

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

With Constant Contact, you can create effective email marketing and other online marketing campaigns to meet your business goals. Start your FREE trial today!

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!

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

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

Use real-time behavior data and AI to convert more customers with Mailchimp's marketing, automation & email marketing platform. Easy to use - start for free!

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

APIs Delivering Global Verification and Programmable Communications as a service. SMS, Voice, and phone number intelligence solutions. Get started now.

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.

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

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

SendHub offers bulk text messaging and marketing for businesses to manage their SMS campaigns. Finally, business communication services made easy.

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

Vonage offers flexible and scalable voice, messaging, video and data capabilities across Unified Communications, Contact Centers and Communications APIs.

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.

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

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

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

Plataforma de Comunicación Omnicanal. Crea una estrategia de comunicación global e integra todos tus canales de comunicación.

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!

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.

🚀Boost your text message marketing with speeds up to 1000 SMS per second. FREE Trial and instant FREE Text Number, start today...

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

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

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.

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

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

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

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

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

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

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.

Telnyx offers solutions tailored to your industry needs, from AI to call tracking. Enhance your business capabilities with our specialized solutions.

Onboard & engage users in 90s with phone identity, verification, OTP & SMS notification. Send reliable voice/SMS OTP with Twillio, MessageBird, Nexmo, Infobip, etc. from 1 API.

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

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

A suite of email marketing tools to monitor Inbox placement, Deliverability, IP health and Sender Reputation, compatible with all Email Service Providers.

Discover the Best SMS Marketing Software Platform for your business. Increase customer engagement with our Text Message Marketing Software. Sign up for our free trial now.

AI transformation partner for enterprises, driving increased revenue, reduced costs, and enhanced customer experience with Exotel solutions.

MailChannels ensures your customers' emails are always delivered. Trusted by the fastest-growing hosting providers.

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

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

Build your very own omnichannel customer engagement platform with a no-code builder or customize it with Video, Voice, SMS, and chatbot APIs from EnableX.

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

Business communication solutions from net2phone streamline workflows, effortlessly collaborate, and build customer relationships that last.

Email checker online tool. Ensure email accuracy with our efficient tool. Verify email addresses instantly and improve your communication reliability. Try for free!

Knowlarity is a leading cloud business communication solution provider with cloud telephony - virtual number, ivr, toll-free number, call center software, AI products (speech, chatbot and voicebots), video & messaging solutions.

MSG91 cloud communications platform integrates cloud-based voice, video, messaging, chat, & collaboration into any app, service, or business process. Request a demo for cloud based communication today!

800.com :) Get 800 Toll-Free Numbers and Vanity Phone Numbers provides toll-free and local numbers that can be routed to cell phones or business landlines. We make it easy to forward calls to anywhere in the world.

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

Bandwidth is an enterprise communications platform with voice, messaging, and emergency APIs for your communications stack.

Clean your email list with Mailercheck's email verification tool and improve deliverability with our email testing suite to boost email marketing ROI.

The all-in-one solution for all your business texting needs - marketing campaigns, two-way SMS chats, notifications, and staff communication.

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.

Knowlarity provides the best cloud IVR(Interactive Voice Response) System or solution for your business which is an automated call management solution. Use our top hosted IVR service to respond to all the customer queries professionally with personalized greetings.

Take the first step to innovative workplace communication with a stable communication core, advanced collaboration tools, and best-of-breed integrations that keep your tech stack intact.

Nevatech Sentinet offers a flexible, lightweight and scalable API Management platform to help businesses maximize the value of their data. Try Nevatech Now!

Dialpad Ai Meetings is an HD video conferencing platform that lets you meet face-to-face with clients and teammates, from anywhere.

Get crystal clear, simple, and reliable for conference calls when they matter most - try OpenVoice today for your audio conferencing solution.

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

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!

Join the ever growing community of happy, healthy telco operators using PortaOne solutions to be competitive & reduce costs. User-friendly & reliable service.

Twilio Segment is a customer data platform (CDP) that helps you collect, clean, and activate your customer data.

Get your message across. One account, so many ways to send.

Engage with your customers at scale on digital channels, including private messaging, communities, email, live chat, and voice self-service.

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

CrowdPower is a simple automation platform that can onboard new users, reduce churn, keep your customers informed, and so much more.

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.

We make text message marketing and SMS marketing easy. Increase revenue and build customer loyalty with our SMS marketing software.

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.

AdButler Ad Server - Discover an ad serving tool suite for all ad formats with ready-to-use or fully customized ad management solutions. Get started for free.