259+ email tools for developers — transactional APIs, newsletter platforms, and drip campaigns. Alternatives to Mailchimp and SendGrid.
Newsletter design tool
DKIM library, to sign & verify email
Browser-based IMAP client with an application-like user interface
Email test server for development
Fast, highly extensible, and event driven SMTP server
A small and easy to configure SMTP and POP3 server for Windows and Linux
Secure SMTP server implementation from the OpenBSD project
An SMTP server for test and development environment
Lightweight configurable multithreaded fake SMTP server. Mimic any SMTP behaviour for your test environment
Complete and fully featured mail server for use by websites & web servers
Mail hosting and management platform including a modern and simplified web user interface
All-in-one mail server with JMAP, IMAP4, and SMTP support and a wide range of modern features