Rebex Mail Pack

IMAP, POP3, SMTP, EWS, MSG, MS Graph, MIME, S/MIME libraries for .NET

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More .NET libraries

.NET libraries

Rebex EWS for .NET

EWS

Provides client-side API for accessing Microsoft Exchange servers using Exchange Web Services (EWS).

Rebex Graph for .NET

Graph

Provides client-side API for accessing Exchange Online using MS Graph API.

Rebex IMAP for .NET

IMAP

.NET library for communication with IMAP servers. Makes it possible to receive, list, search and remove e-mail messages.

Rebex MSG for .NET

MSG

.NET library for reading, processing and writing Microsoft Outlook .MSG e-mail message files.

Rebex POP3 for .NET

POP3

.NET library for communication with POP3 servers. Makes it possible to receive, list and remove e-mail messages.

Rebex SMTP for .NET

SMTP

.NET library for sending e-mails using SMTP servers.

Supported formats and protocols

Client protocols

  • SMTP
  • POP3
  • IMAP
  • MS Graph API (Microsoft 365)
  • EWS (Exchange Web Services)
  • TLS 1.2, 1.3

Read/write formats

  • EML (MIME ad S/MIME)
  • Plain text
  • RTF
  • HTML
  • Outlook MSG

Read only formats

  • TNET (winmail.dat)

Main features

SMTP and PickupDirectory for sending emails

Send a message using a single line of code. TLS/SSL support. Direct sending to recipient's SMTP server.

IMAP for advanced mailbox access

Upload and download messages using IMAP protocol. TLS/SSL support. Work with email folders. Multiple message operations - copy, delete, or set flags for a range of messages in a single operation. Search for messages with specific attributes.

EWS for sending and receiving emails using Exchange

Upload and download messages using Exchange Web Services. TLS/SSL support. Work with email folders. Multiple message operations - copy, delete, or set flags for a range of messages in a single operation. Search for messages with specific attributes. Send emails using EWS.

Access Microsoft 365 (Exchange Online) using Graph API

Upload and download messages using Microsoft Graph API. TLS/SSL support. Work with email folders. Multiple message operations - copy, delete, or set flags for a range of messages in a single operation. Search for messages with specific attributes. Send emails using MS Graph API.

POP3 for email retrieval

Retrieve messages using a simple POP3 protocol. TLS/SSL support. Retrieve message lists with size, sequence number, unique ID or headers.

Outlook MSG file reading and writing

Manipulate subject, body, recipients and attachments of Outlook .MSG messages.

Or list and manipulate MAPI properties of .MSG messages directly.

Signed and encrypted emails (S/MIME)

Supports message encryption and decryption. Supports signing and signature validation. Based on X.509 certificates and Cryptographic Message Syntax.

RSA/OAEP and RSA/PSS on all platforms

Use RSASSA-PSS signatures and RSAES-OAEP encryption with SHA-1, SHA-256, SHA-384 or SHA-512 on all supported platforms including .NET Framework 2.0 and .NET Compact Framework.

Easy-to-use API

Connect, log in, search for new messages, download messages, disconnect. Send email with attachments. It's easy to start developing with our library. Simple code for common use cases.

Lots of sample code.

Trusted by thousands of .NET developers worldwide

Thousands of developers chose Rebex Mail Pack (formerly Secure Mail) for adding SMTP, IMAP, POP3, EWS, Graph, MIME or S/MIME capabilities to their applications.

Up-to-date TLS support

Rebex Mail Pack supports modern TLS versions on all mainstream platforms. This ensures that your emails are transfered securely and reliably. Rebex Mail Pack supports both implicit or explicit TLS/SSL and provides a rich set of security features. You'll find APIs for TLS/SSL security, X.509 certificates, and more.

  • TLS 1.3 on mainstream platforms including .NET 3.5-4.8 on Windows 7 (or Windows XP SP3 with plugins)
  • TLS 1.2, 1.1, 1.0 on all platforms (including .NET Compact Framework 3.5/3.9)
  • Elliptic Curve DSA and Elliptic Curve Diffie-Hellman ciphers (requires a plugin on some platforms)
  • AES/GCM ciphers
  • Elliptic Curve DSA and Elliptic Curve Diffie-Hellman ciphers
    (requires plugin on some platforms)
  • SHA-2 certificates
  • SHA-2 hashing algorithms
  • Server Name Indication (SNI) extension
  • Renegotiation Indication extension
  • Support for legacy SSL 3.0 protocol

Many, many more time-tested features

Rebex Mail Pack is a mature and stable library maintained since 2006. We have been adding new features year after year, inspired by user feedback. For example:

  • Task-based Asynchronous API (.NET 4 or later)
  • Automated (or custom) certificate validation
  • Sending raw POP3/SMTP/IMAP commands
  • Sending email on behalf of another user
  • Logging all communication with the server
  • Ability to use Mail Pack in SSIS, SQL CLR and PowerShell
  • FIPS 140-2 compliant mode

And many, many more...

Platforms

.NET

8, 7, 6, 5

.NET Framework

3.5 SP1, 4.0-4.8.1

.NET Core

3.1

Mono

6.0 or higher

Xamarin.iOS

13.10 or later

Xamarin.Android

10.1 or later

Legacy platforms

(not included in standard product packages - see more)

 

.NET Compact Framework

3.5/3.9

.NET Framework

2.0-3.5
 

Featured samples

  • WinForms IMAP client - mailbox browser
    Allows you to browse, view and manage mail messages in a remote IMAP mailbox, without actually downloading them. Demonstrates how to connect to IMAP server, download emails, read its content, work with attachments.
  • MIME explorer
    Views contents of structured MIME files (mail message, .EML or .MHT file).
  • WinForms Exchange Client - EWS mailbox browser
    Allows you to browse, view and manage mail messages in a remote Microsoft Exchange mailbox, without actually downloading them. Demonstrates how to connect and authenticate to Exchange server using Exchange Web Services (EWS), browse folders, download and delete emails, read email's content, work with attachments.
  • WinForm mail sender application
    Write an e-mail, add an attachment and send it, either synchronously or in the background, with or without progress bar dialog.
View all 26 C# and VB.NET samples

Satisfied clients

With Rebex IMAP library the number of support calls regarding IMAP protocol problems decreased to almost zero. We are very happy with Rebex Secure Mail (now "Mail Pack") and can warmly recommend it to anybody.

Stefan Schultze

CTO, MailStore Software

My team has been using Rebex Secure Mail for .NET (now "Mail Pack") for two years and it is really solid. Our service (http://nutshellmail.com/) pulls down millions of POP3 and IMAP messages across all major ISPs on a daily basis. Rebex successfully parses the headers of all these messages. We also use Rebex for our outbound SMTP needs.

We have hit some obscure problems in the past (i.e. GoDaddy's POP3 servers not fully complying with RFC1939); Rebex support was extremely responsive and quickly provided us with a patch.

daviddlyman

NutshelMail.com

I decided to give Rebex.Mail a try and I was very satisfied with the results! Not only is the standard fully and properly respected, it's also significantly faster. It only took half a day to migrate my existing code as the API is very similar to .NET's built-in classes.

Dominic St-Jacques

Amilia Corporation Inc.

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