ActiveX SMTP / POP3 Email Component with S/MIME for signed and encrypted mail, attachments,
HTML
mail,
Auto-Zip
and Unzip attachments, XML import and export, SMTP authorization,
Outlook
integration,
distribution
lists, internationalized, mail-merge, automatic
Base64
and quoted-printable
encoding
and decoding, return-receipt, Smart Card support,

AES encryption, EML import
/ export,
automatic signature verification and decryption,
more...

Easy-to-use ActiveX email component to effortlessly mail from ASP/ASP.NET web pages. Features logging to text file or ADODB, SMTP authentication, COM+ integration and a quick test facility to test the component without writing a single line of code. Messages can be sent in plain text, HTML or other MIME formats. Additional features include multiple attachments, recipients, CC recipients and BCC recipients. Flexible licensing options available.

PBEmail it's an advanced email component with full security features. It includes S/MIME encryption and signing, SSL/TLS protocol support, and direct sending without an SMTP server configuration. Emails can contain text, html or both types of bodies, unlimited attachments, related content and more.

Supports asynchronous and synchronous sending with full multi-threaded operation. Includes both ActiveX OCX and DLL.

MailLib is a free component for sending and receiving e-mails using SMTP/POP3.
The component can be used in Windows scripting, ASP or any other client application that supports COM

MailBee SMTP is a powerful and easy to use COM object which enables ASP and Windows applications to create, send and queue mail to SMTP servers. Secure authentication, email validation, correct MIME composer, multiple attachments, and much more. Can be used in conjunction with SSL, POP3 and IMAP4 components. Royalty-free distribution.

"The Email Validation Component is a true native, 100% managed C# component that can be implemented for both Webform and Winform."

Email Validation Component does:
1. An accurate syntax check
2. A domain check by looking up MX records
3. A username test using SMTP

We've packed a full set of solid, professional networking code into a simple component. With only one method call.

EASendMail enables your C#, VB.NET, JScript.NET, ASP.NET or other .NET framework applications to send Text/Html email based on SMTP/ESMTP protocol. It is a full-featured component which supports all operations of the SMTP/ESMTP protocol, MX DNS lookup, sending email in backgroud, simulating SMTP server, multi-threading, sending email in schedule, SSL/TLS, S/MIME, digital signature, failure delivery-report, and many other advanced features.

EAGetMail enables your C#, VB.NET, JScript.NET, ASP.NET or other .NET framework applications to parse and receive email based on POP3/IMAP4 protocol. Many advanced features are supported including TNEF parser (winmail.dat) and S/MIME. Easy-to-use and featured examples are included in the installation file.

.NET SMTP / POP3 Email Component with S/MIME for signed and encrypted mail, attachments,

HTML mail, Auto-Zip and Unzip attachments, XML import and export, SMTP authorization,
Outlook
integration, distribution lists, internationalized, mail-merge, automatic
Base64
and quoted-printable encoding and decoding, return-receipt, Smart Card support,

AES encryption, EML import / export, automatic signature verification and decryption,
more...

.NET SMTP / POP3 Email Component with S/MIME for signed and encrypted mail, attachments,

HTML
mail, Auto-Zip and Unzip attachments, XML import and export, SMTP authorization,
Outlook
integration,
distribution lists, internationalized, mail-merge, automatic
Base64
and quoted-printable
encoding and decoding, return-receipt, Smart Card support,

AES encryption, EML import
/ export, automatic signature verification and decryption,
more...