ASP.NET Auto Email   
http://www.360impact.com

ASP.NET Auto Email is the #1 email control for ASP.NET. Create sophisticated email forms without any programming. This advanced control automatically detects all of your form fields, and even adds attachements if you have file fields in your form. You control the subject, message header and footer, where the email gets sent and more. Create ASP.NET email form faster and easier than ever with no programming required. Includes Visual Studio.NET and ASP.NET Web Matrix design-time support. Full documentation, and sample form included. Download now.

E-Mail Expert   
http://www.evansprogramming.com

E-Mail Expert is an activeX control and a COM DLL for sending SMTP and MIME e-mail messages. We supply both a DLL and an activeX control to give you maximum flexability. E-Mail Expert works with VB, .NET, C++, VBA, FOXPRO and all other activeX supporting languages. E-Mail Expert was designed to be easy to use, yet not restrict developers that have an advanced understanding of email, SMTP, MIME or Winsock. Best of all, a local SMPT server is NOT required! E-Mail Expert has ALL the features you need to easily create a professional e-mail sending application or component. PLUS, E-Mail Expert is smart, flexible and expandable. Smart because unless you explicitly overwrite a setting, E-Mail Expert will select the most correct settings for you. Flexible because E-Mail Expert exposes a low-level Winsock interface if you need it. Expandable because you can use E-Mail Experts' built-in Values collection to add private and custom email properties, thus adding new cabilities. Includes a detailed help file, comprehensive example programs (including a complete email send application w/ source) a royalty-free re-distributable setup program and license to distribute your finished applications and components, royalty-free. Free support and upgrades to registered users. 30 day unconditional money-back guarantee.

WakiMail   
http://www.wakisoft.com

WakiMail is a email component. It can be used on asp.net or winform program to send email.The most difference from framework's email class is it support SMTP validate. It's very easy to send email using it. And it's absolute free now.

Catalyst Internet Mail Control   
http://www.catalyst.com

The Catalyst Internet Mail ActiveX control enables developers to easily integrate e-mail functionality within their applications. The control implements the standard protocols for sending, receiving and composing Internet e-mail messages, and can be used in a wide variety of programming languages which support ActiveX components. Designed specifically for rapid application development, a single component provides a flexible, comprehensive interface without requiring that the developer use several controls and write additional code to integrate them. A simpler, unified interface means fewer lines of source code, less complexity and reduced maintenance costs, allowing developers to focus on their core application. Advanced features, such as multiple authentication methods and delivery status notification, are also part of the standard feature set of the control. Complex messages, such as those which contain both plain and styled text as well as multiple file attachments, can be easily created and processed with just a few lines of code. The control also supports encrypted message delivery and retrieval using the SSL/TLS protocol for those developers who require security features. The Catalyst Internet Mail control was developed using the core technologies in the SocketTools family of products, and is based on a solid foundation of award-winning software which conforms to standard protocols and has been market tested since 1995. The product includes example programs, a printable Developer's Guide and Technical Reference as well as context-sensitive online help. As with all Catalyst components, the Internet Mail control is licensed royalty-free, without any runtime licensing fees.

Chilkat SMTP / POP3 ActiveX Email Component   
http://www.chilkatsoft.com

A POP3 / SMTP email ActiveX component for sending and receiving email. Packed with advanced features including: full S/MIME capability for sending and receiving signed and encrypted email, MHTML for sending HTML email with embedded images and style sheets, multipart/alternative, multipart/related, attachments, advanced AES encryption, automated international character encoding conversion, Outlook integration, progress monitoring, Outlook Express EML import, XML import and export, mail-merge, distribution lists, auto-Zip and Unzip attachments by integrating Chilkat Zip, Outlook contacts and distribution list integration, bad email address detection and collection, SMTP Windows Integrated Authorization, smart cards, SMTP and POP3 server diagnostics, full control over Cryptographic Service Providers for S/MIME, and more.