MailKit

Features

Email Clients - Provides a comprehensive .NET library for building cross-platform applications that implement email client functionality.
Email Protocol Libraries - Serves as a comprehensive cross-platform .NET library for IMAP, POP3, and SMTP protocol implementation.
SMTP Clients - Implements a client library for composing and transmitting email messages to remote SMTP servers.
Protocol Abstraction Layers - Provides architectural layers that standardize IMAP, POP3, and SMTP into a consistent internal API.
Email Header Parsers - Extracts metadata and routing information by scanning and tokenizing the initial block of an email message stream.
Email Transmission Services - Transmits email messages to recipients using the SMTP protocol with secure encryption and authentication.
IMAP Client Integrations - Provides capabilities to manage email folders, search messages, and update flags via IMAP integrations.
POP3 Email Retrieval - Implements the POP3 protocol for downloading email messages from servers with support for encryption.
Secure Socket Wrappers - Manages raw TCP connections with integrated security layers for TLS-encrypted communication.
Stream-Based Email Parsers - Processes email data from input streams to handle large attachments without loading the entire message into memory.
SASL Implementations - Implements the Simple Authentication and Security Layer for client-server identity verification.
Protocol State Machines - Tracks current session state and expected responses to manage asynchronous communication with mail servers.
MIME Tree Decompositions - Represents complex email structures as a hierarchical tree of parts for granular access to bodies and attachments.
Email and Messaging - Loads and parses email messages from data streams or files, supporting various mailbox formats.
Email Attachments - Enables the creation of email messages with text bodies and structured file attachments.
Email Content Parsing - Traverses MIME structures to extract the most appropriate plain-text or HTML versions of an email body.
IMAP Mailbox Managers - Provides capabilities to search, sort, move, or delete messages and update status flags within an IMAP account.
IMAP Client Interfaces - Provides programmatic access to specific system or custom mail folders using standard IMAP naming conventions.
Partial Message Retrieval - Provides the ability to retrieve individual email parts or summary details to optimize bandwidth and performance.
OAuth Authentication - Connects to mail servers using secure OAuth 2.0 tokens instead of traditional passwords.
Mail and Messaging - Cross-platform library for IMAP, POP3, and SMTP.

Open-source alternatives to MailKit

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neomutt/neomutt
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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
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foxcpp/maddy
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Maddy is a modular mail server that assembles a complete email system by connecting small, single-purpose modules through a declarative configuration file. Rather than a monolithic stack, it lets operators compose message processing, storage, authentication, and security enforcement from interchangeable building blocks, with each module handling a specific function like receiving SMTP connections, verifying credentials, or applying policy checks. The server distinguishes itself through its flexible authentication and security architecture. It delegates user verification to external systems in
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roundcube/roundcubemail
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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
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imapsync/imapsync
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imapsync is an IMAP mailbox synchronization tool and data migration utility designed to copy and synchronize email messages and folder structures between two IMAP servers. It functions as a migration manager for transferring bulk email accounts between different hosting providers, preserving folder hierarchies and message metadata. The tool is distinguished by its ability to automate the transfer of multiple mailboxes sequentially from delimited lists using administrative credentials or user-specific authentication. It supports advanced authentication methods including OAuth2 and XOAUTH2, and
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See all 30 alternatives to MailKit

jstedfastMailKit

Features

Open-source alternatives to MailKit

neomutt/neomutt

foxcpp/maddy

roundcube/roundcubemail

imapsync/imapsync

Star history

Open-source alternatives to MailKit

neomutt/neomutt

foxcpp/maddy

roundcube/roundcubemail

imapsync/imapsync