Mailjet

A professional email hosting service designed for businesses of all sizes. Zoho Mail offers secure, ad-free email with features like custom domain support, large attachment limits, and robust spam and virus protection. The platform includes collaboration tools such as calendars, tasks, and notes, integrated within the email interface. Zoho Mail's strength lies in its integration with other Zoho productivity apps and its focus on privacy and security. It's particularly suitable for businesses looking for a cost-effective, feature-rich alternative to more mainstream email providers.

A unique cloud-based email delivery service that allows developers to send emails directly from client-side JavaScript code without the need for server-side implementation. EmailJS provides a simple API and pre-built templates, making it easy to integrate email functionality into web applications and static websites. The service offers features like dynamic template variables, attachments support, and detailed sending logs. EmailJS is particularly useful for frontend developers and small projects that require email functionality without the complexity of setting up a backend server.

Mailman is free software for managing electronic mail discussion and e-newsletter lists. Mailman is integrated with the web, making it easy for users to manage their accounts and for list owners to administer their lists. Mailman supports built-in archiving, automatic bounce processing, content filtering, digest delivery, spam filters, and more.

A robust cloud-based email delivery platform specializing in both transactional and marketing emails. SendGrid offers powerful APIs for developers to integrate email functionality into their applications, as well as a user-friendly interface for marketers to create and manage email campaigns. The platform provides advanced deliverability tools, including IP warmup, dedicated IPs, and reputation monitoring. SendGrid's analytics offer detailed insights into email performance, including open rates, click-through rates, and bounce rates. Its scalability and focus on deliverability make it particularly suitable for businesses sending high volumes of emails or those requiring reliable transactional email delivery.

SmtpJS is a free library you can use for sending emails from JavaScript.