Rebex Graph

RebexCommunication & Messaging Tools.NET
Version 8.0.9673 (Jun 25, 2026)

Access Exchange Online mailboxes from .NET using Microsoft Graph.

  • Connect and authenticate with Microsoft 365 Exchange Online.
  • Send, receive, and manage emails including drafts and attachments.
  • Supports asynchronous operations and advanced mailbox features.
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.NET client library for Microsoft Graph API (Exchange Online).
Rebex Graph is a .NET client library designed for integration with Microsoft 365 Exchange Online through the Microsoft Graph API. It enables developers to send, receive, search, and manage email messages while supporting security features such as TLS and S/MIME, and advanced mailbox operations including impersonation and shared access.

Microsoft Graph Mailbox Access

Provides a straightforward API to perform common mail operations like connecting, authenticating, retrieving unread emails, downloading messages, and sending emails.

Connecting and Authenticating

Supports connection to Microsoft 365 servers and authenticates using OAuth access tokens, enabling secure access to Exchange Online mailboxes and services.

Comprehensive Email Sending

Allows sending new mail messages, forwarding, replying, sending drafts, and sending on behalf of other users with full control over message parameters and recipient instructions.

Message Operations

Enables listing, paging, downloading, uploading, moving, deleting, and searching messages with detailed information and support for Exchange and MIME identifiers.

Folder Management

Supports retrieval of folder and subfolder lists including well-known folder IDs, enabling organized mailbox navigation and operations.

Advanced Features

Includes impersonation to act on behalf of different users, access shared mailboxes, and execute advanced search queries.

Asynchronous Programming Support

Implements various asynchronous patterns including Task-based Asynchronous Pattern and 'await' operator.

Robust Security and Standards Compliance

Supports TLS 1.2/1.3 protocols, S/MIME for secure email signing and encryption using X.509 certificates, and flexible certificate validation methods.

Proxy and Custom Socket Support

Compatible with SOCKS4/5 and HTTP CONNECT proxies, supports single sign-on, SSH as proxy, and allows for custom socket implementations.

Product Compatibility

Review the details below to ensure this product is supported within your environment.

Component Type

  • .NET

.NET Version

  • .NET 10 LTS
  • .NET 9 STS
  • .NET 8 LTS
  • .NET 5 / .NET Core 3.1
  • .NET 4.8 or earlier

.NET Platform

  • .NET Assembly
  • .NET Class
  • .NET Core 3.1 Assembly

IDE Support

  • Visual Studio