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Ultimate POP3 Component for .NET

Easily list, receive, parse, and process email messages on POP3 servers.

The Ultimate POP3 component is a part of the Mail Component which offers a comprehensive interface for receiving e-mail messages from a server and managing them remotely, all from within your application. In addition, you also have the capability to compose, decrypt, encrypt, sign, and validate email messages.

The library includes support .NET Framework, Mono, Xamarin Android, iOS, and .NET CF. If you only require a package for mobile, see the POP3 Library for Mobile for more details.

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Receiving and managing email messages easily

The POP3 component offers a comprehensive interface for POP3, providing the developer with everything required to incorporate mail management tasks in an application as listed below:

  • Connect to standard POP3 server or secure POP3 server over TLS/SSL. It supports both Implicit and Explicit security modes
  • List email messages
  • Download entire or partial messages to a disk file or stream
  • Delete messages
  • Purge messages
  • Obtain mailbox information
  • Authenticate securely with APOP, CRAM-MD5, DIGEST-MD5, NTLM, and Kerberos methods

Supports MIME and S/MIME

When designing the POP3 component, our focus is on ease-of-use, performance, reliability, and flexibility. As a benefit, you do not need to have a thorough understanding of how the POP3 protocol is implemented and how to read, encrypt, decrypt, sign and validate a message; the POP3 component does all the hard work for you. The following is a list of some key MIME and S/MIME features:

  • Load and save message from/into MailMessage object
  • Supports multiple recipients with To, CC, and BCC headers
  • Attach multiple files
  • Encrypt, decrypt, sign, and validate email messages easily
  • Extract attachments from MS-TNEF (winmail.dat) files
  • Import HTML file or web page into e-mail
  • Forward message as attachment
  • Base64 and Quoted-Printable
  • Fully support creating and displaying HTML messages with embedded resources such as image, source, etc. in your applications

Security and Reliability

The Ultimate POP3 component provides industry standard security using the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols. Our components support strong, commercial grade encryption, and do not rely on any third-party toolkits which have licensing restrictions or are encumbered by patents. By setting a single property or option, the component automatically handles all of the complex certificate management, protocol negotiation and encryption for you. Even advanced options, such as using client certificates, are handled easily with just a few lines of code.


Supports HTTP Connect, SOCKS4, SOCKS4A & SOCKS5 Proxy Servers

Ultimate POP3 provides full support for Proxy Servers such as HTTP CONNECT, SOCKS4, SOCKS4A, and SOCKS5. By simply setting a few properties, you are able to receive email messages from POP3 servers through the desired proxy server, providing your application with the greatest flexibility and the highest level of security available.


Support for IPv6, the next generation Internet protocol

IPv6 (Internet Protocol version 6), the next-generation protocol designed by the IETF (Internet Engineering Task Force), will gradually replace the current version of the Internet Protocol, IPv4.

With Ultimate POP3 Component, you have an integrated service assurance solution that will provide POP3 and proxy capabilities in mixed IPv4 and IPv6 environments. This helps organizations with the adoption of and the transition to IPv6 by making the management of such networks seamless.


.NET Technology

By using 100% managed code written in C#, the Ultimate POP3 component takes advantage of the numerous built-in features of the .NET Framework to enhance performance. Moreover, the component is CLS compliant, and it does not use any unsafe blocks for minimal permission requirements. In addition, the component is highly compatible with Microsoft ClickOnce.


Supports many .NET Platforms

Ultimate POP3 Component for .NET supports the following platforms:
  • Windows Forms
  • Web Forms
  • Web Services
  • WPF

In addition, it is also possible to use the component in PowerShell - Microsoft’s new command console and scripting language.

Ultimate POP3 is fully compatible with Visual Studio 2005 to 2015 (.NET 2.0 to .NET 4.6). A benefit of using our product is that they keep you up-to-date with Microsoft's latest technologies.


Supports event-driven (Asynchronous) and blocking (Synchronous) Design

Most applications written with the POP3 component will be synchronous. The synchronous method ensures ease-of-use, but it can only returns the control back to the caller after it has finished, meaning that it blocks the execution of the caller for a period of time. Using the synchronous method is recommended when you only need to execute one POP3 operation at a time.

However, you might decide that your design requires an asynchronous operation when it is needed to manage email messages simultaneously; powerful asynchronous methods provide this capability. The asynchronous method is executed on a thread separate from the calling thread. Such operation is useful when an POP3 operation is time-consuming and other codes need to execute without waiting for the initial operation to complete. In addition, the user interface will be most responsive when asynchronous methods are used.



The POP3 component has been designed with a great degree of flexibility and can be used with a wide variety of programming languages and different types of development environments. Available as a managed .NET class, it is fully supported by languages such as Visual Basic, Visual C#, J#, Managed C++, Borland C# Builder, and Delphi.


Fully Documented

As important as functionality, features and stability are, comprehensive documentation is equally as important to the application developer. This is why the ComponentPro POP3 for .NET product includes a Developer's Guide and a complete Technical Reference which documents every property, method and event supported by the component. A printable version of the documentation is included with the product, as well as context-sensitive online help which can be accessed directly from within the development environment.


Many complete POP3 client samples in C#, VB.NET, and ASP.NET

In addition to the fully documented Developer's Guide and a complete Technical Reference, the Ultimate POP3 component also includes a number of samples with full source code which help you become familiar with the features of the component and provide code which you can re-use in your own applications. The setup package contains three complete POP3 client applications: POP3 Console Client, POP3 WinForms Client, and POP3 WebForms Client.



ComponentPro understands today's software development requirements which often require support for multiple operating systems and different programming languages. As with all ComponentPro components, the product is licensed to a single developer, and applications built using the POP3 component can be redistributed to as many end-users as needed without additional royalties or runtime licensing fees. Developers are also permitted to install the product on different development systems as long as they are the only one using it and there is no potential that it can be used by more than one developer simultaneously.



Our developers have been using the Ultimate Suite for over 6 mons now on an intranet web application. We were very impressed by the feature-set, the ease of use and the great online tutorials and code examples. I will recommend ComponentPro to my colleages.
Mark Deaney - CTO PowerCT
Your products are great. It makes my life so much easier. Now I only need to focus on business logic instead of having to deal with many limitations of the .NET framework.
Geoff Suddard - Software Developer Office Choice Limited

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