Cllavio — Email Marketing & SMTP API for Startups (Free Plan)
Email deserves a dust off. A renovation. Modernized for the way we email today. With HEY, we’ve done just that. It’s a redo, a rethink, a simplified, potent reintroduction of email. A fresh start, the way it should be. | Email marketing that actually lands: campaigns + SMTP API, deliverability guardrails (SPF/DKIM/DMARC), analytics, and transparent pricing. Start free. |
Screen emails like you screen calls; Fix bad subjects without busting threads; The Imbox: It’s not a typo; Find files without digging through threads; Quiet by default, loud at your discretion; A built-in ‘Reply Later’ workflow; Just set it aside; Blocking email spies 24/7/365; Bundle dominating senders into one line; Send massive files without using other apps | email marketing, campaigns, transaction emails, simple prices |
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An easy to use email app that saves you time and keeps your messages safe. Get your messages instantly via push notifications, read and respond online & offline, and find any message quickly.

It is the world's largest secure email service, developed by CERN and MIT scientists. We are open source and protected by Swiss privacy law

It is an application that is used mainly to send and receive emails. It can also be used to manage various types of personal data including calendar appointments and similar entries, tasks, contacts, and notes.

It is a free feature-rich email service with unlimited mailbox size. It has two-factor authentication and login history to prevent hacking. It scans all incoming mail for both spam, phishing, and malware.

It is not just another email client. They are rebuilding the inbox from the ground up to make you brilliant at what you do. Specifically designed it for those of you who want the best.

It is an open source server and secured & fast customer software for messaging and collaboration. The software consists of both client and server components, and a desktop client. It also provides native two-way sync to many mobile devices.

Work smarter with business-class email and calendaring. It helps you collaborate on your critical documents and gives you a focused inbox that prioritizes important messages and adapts to your work style.

It is a free, open source mail server solution for your favourite Linux/BSD. You can deploy an open source, fully fledged, full-featured mail server in several minutes, for free.

Gmail client built for OSX with Calendar and Gmail support to allow usage in the familiar Gmail environment.

It is an API-first email hosting service with a user-friendly interface. It provides affordable scalability for small & large businesses using dedicated email servers without any per-user/per-domain limits. Furthermore, the powerful API enables you to meet your changing business requirements with ease.