Java Email Libraries

NeoMutt is a terminal-based electronic mail management system that provides a text-based user interface for reading and composing emails. It functions as a mail manager and client supporting IMAP, POP3, and SMTP protocols, as well as NNTP for newsgroup access. The project distinguishes itself through integrated support for PGP and S/MIME encryption, providing tools for signing and encrypting messages and managing cryptographic keys. It supports modern authentication via OAuth2 and offers specialized MIME-aware reading capabilities for decoding multipart messages and visualizing MIME structure

Pop is a command-line email client and utility used to compose and deliver electronic messages directly from the terminal. It functions as a dispatch system that routes messages through SMTP servers or third-party API services. The tool includes a markdown composer that transforms markdown text into formatted HTML for email bodies. It manages sender identities and server credentials through a combination of persistent default configurations and environment variables. The system supports appending binary data from the local filesystem as attachments and provides a pipeline for automated email

Roundcube is an open-source, self-hosted webmail client designed for reading, composing, and organizing emails stored on remote servers using IMAP and SMTP protocols. It provides a browser-based interface that allows users to manage their mailboxes and sender identities through a secure communication platform. The platform is distinguished by its modular architecture, featuring a plugin-based extension system for adding new functional modules and a skin-based theme layer for customizing the visual appearance and responsive layouts. It further supports embedding its interface into external clo

Hutool is a standard utility library for Java application development designed to simplify common programming tasks and reduce boilerplate code. It provides a comprehensive collection of reusable helper classes and static utilities to streamline development across the Java ecosystem. The project implements a wide array of specialized toolkits, including systems for cryptography and security, network communication via HTTP and JSON clients, and the processing of office documents and file system IO. It also features a concurrency and scheduling framework for managing asynchronous tasks and recu

Zero is an email automation and link management platform designed for self-hosted infrastructure. It functions as an intelligent system that categorizes, prioritizes, and responds to incoming email communications using autonomous agents, while synchronizing message history into local storage for efficient data processing. The platform distinguishes itself by integrating enterprise identity providers to manage team access and permissions across shared resources. It also features a comprehensive link management toolset that generates branded URLs and personalized QR codes, supported by advanced

FairEmail is an open-source email client for Android that supports standard IMAP and SMTP protocols. It serves as a privacy-focused communication tool that manages multiple accounts through a unified inbox and provides PGP encryption and decryption for secure messaging. The application prioritizes data privacy by blocking tracking pixels and requiring manual confirmation before loading external images. It secures sensitive information through biometric authentication and personal identification numbers to restrict unauthorized access to the device. The client includes a suite of organization

Postal is an open-source email infrastructure and self-hosted delivery platform. It functions as an SMTP mail server and inbound email gateway, providing the tools necessary to send and receive email through a privately managed infrastructure. The system manages SMTP infrastructure for outgoing message delivery and provides capabilities for custom email receiving. It allows for the routing of incoming external emails to internal applications or websites for automated processing. The platform includes support for multi-tenant domain mapping, event-driven webhook notifications, and plugin-base

Mox is a self-hosted email server that runs as a single compiled Go binary, handling the full lifecycle of sending and receiving email through SMTP, IMAP4rev2, and a built-in webmail application. It is designed to be operated without external dependencies or runtime plugins, with all mail services — including spam filtering, queue management, and web interfaces for administration and account management — contained in one executable. The server distinguishes itself through automated TLS certificate management via ACME, DNS-based autoconfiguration for email clients, and file-based configuration