EMailTools

EMailTools is a software toolkit designed to help developers and organizations manage email workflows within applications and campaigns. It provides components for composing, sending, delivering, parsing, and analyzing email messages, with emphasis on programmability, scalability, and deliverability.

Key features include protocol support for SMTP, IMAP, and POP3, as well as API-based sending. It includes a template engine for HTML and plain-text emails, inlined CSS rendering, and support for attachments and inline images. The toolkit supports batch sending, scheduling, and retry logic, along with bounce handling, suppression lists, and unsubscribe management. It offers analytics dashboards and exportable delivery reports, plus message validation and parsing with header extraction and MIME handling. Contact management and segmentation features enable targeted campaigns. The system is designed to be extensible, with plug-ins or adapters to integrate with existing services and providers.

The architecture is modular and provider-agnostic, featuring a core sending engine, provider adapters, and optional plugins. Language bindings exist for popular platforms such as Python, JavaScript, Ruby, and PHP, enabling integration with a variety of stacks. The project emphasizes testability, observability, and security best practices, including DKIM/DMARC/SPF validation and TLS transport.

EMailTools originated as an open-source effort to simplify building reliable email services. It is used for transactional emails, newsletters, and alerting in small and large deployments. The project is released under an open-source license and maintained by an international community of contributors, with documentation and examples available to facilitate adoption.