ActiveEmail SMTP E-mail Development Kit   
http://www.activexperts.com

With the ActiveEmail OLE/COM component, you can add and control e-mail functionality within your project in short time. The component does not need MAPI. Sending messages features: custom header fields for messages. create message body (plain or HTML). Create message body using character sets like US-ASCII, ISO-8859-2. Add attachments using Base64 or Quoted-printable. Attachments can be embedded in message body. Add MIME entities. You can set the message sender, add multiple message authors, add multiple Reply-To (singles and groups), add multiple primary, CC, and BCC recipients singles and groups. Authentication using the AUTH LOGIN mechanism. To improve performance, outgoing mails can be queued instead of send them directly, and processed in the background the ActiveEmail Queue service (with no extra costs). The product also features NNTP news postings to news servers. Product can be used with ASP, VBScript, JavaScript, Access, Visual Basic, Visual C++, C#, VB.Net, ASP.Net on various operting systems, including Windows 98, Windows ME, Windows NT 4, Windows 2000, Windows XP and Windows 2003. Check out http://www.activexperts.com/activemail to view online samples. Received 'Toolkit of the Year' award by <a href="http://www.itilfoundations.com">www.itilfoundations.com</a>

Arclab Email Toolbox   
http://www.arclab.com

Incorporate email send (SMTP/ESMTP) capability into your application or script. Arclab Email Toolbox is a COM-based component for use with Visual Basic, Visual C++, Access, Excel, ASP, VBscript and other COM compatible containers. It fully supports rich text (HTML) messages with images and attachments, multiple recipients (TO,CC,BCC), custom headers and many more. It includes all functions for SMTP, ESMTP, POP AUTH and direct mail relay.

SocketTools Secure Scripting Edition   
http://www.catalyst.com

SocketTools Secure Scripting Edition consists of Component Object Model (COM) libraries designed for use in scripting languages such as VBScript and JavaScript. The components do not have the inherent overhead of ActiveX controls and implement a threading model for more efficient use with Active Server Pages (ASP) and similar environments. This edition includes support for the industry standard Secure Sockets Layer (SSL) and Transport Security Layer (TLS) protocols which are used to ensure that data exchanged between the local system and a remote host is secure and encrypted. The Secure Editions implement the major secure protocols such as HTTP, FTPS, SMTPS, POP3S, IMAPS and more. Your data is protected by industrial strength 128-bit encryption, with full support for client certificates. Using the popular SocketWrench component that is part of SocketTools, you can also write your own, custom secure server applications. And there's no need for you to understand the details of certificate management, data encryption or how the security protocols work. All it takes is a few lines of code to enable the security features, and SocketTools handles the rest!