PBEmail   
http://www.perfectionbytes.com

Award-winning PBEmail is an Email Component that includes an ActiveX Control (OCX) and ActiveX DLL. It can send emails without any SMTP server configuration by the user. PBEmail detects the recipient's SMTP server and sends each email directly, bypassing any SMTP server!: No other Mailing Component does this. You can send a virtually unlimited number of emails simultaneously because PBEmail is fully multi-threaded. Security it's important for us, and that's why PBEmail includes SSL/TLS support, and S/MIME signing and encryption to be one of the most secure email component in the market. Every Email sent using the PBEmail Component can include attachments, and can be formatted in HTML, text or alternate. It supports related content, and you can even ask for a receipt when read. XML export and import it's fully supported. Includes Documentation with examples for every method and properties.

wodSmtpServer   
http://www.weonlydo.com

WeOnlyDo! SmtpServer ActiveX control is a component that can be easily integrated into your applications to provide full non-relaying Smtp (Simple Mail Transfer Protocol) server implementation. All you need to do is to put it on VB form, call it's Start method and it's immediately accepting connections by your clients! It fully supports commands defined in RFC2821. Use your favorite mail client (such as Outlook Express or Eudora) to send mail to other users on your network . How? That's easy part: just put SmtpServer control on your form, add some code around and it's all setup to be used. If you dislike adding additional code - it's fine by Smtp. It will still work, and accept all emails but delete them immediately after user disconnects. But, if you define real filename on your disk, all the emails will be stored to that file. Still, if you want to make real Smtp server application, look no more for native support for socket related material - you just found it. Smtp server will deal with clients and connections - you must deal with messages. Once new user connects to your Smtp server, you need to provide some way of storing message posted by user to some file on disk, or just read it from Body property and store manually to, for example, database. This is really easy task. If you keep all the emails in separate files, that's just great for usage with WeOnlyDo! Smtp server. If you prefer to keep it in one large file - we will not argue about it. You can specify filename, make Smtp server Append to that file, and everything will still work just great. As a result, you will have one mailbox for each user just like on UNIX computers. Together with WeOnlyDo! Pop3 server, you can make powerful fully maintained mail service application that will share emails in your company, receive them from internet and anything else you can imagine. You can even create emails for your employees on the fly. You can make Smtp store to same files from where Pop3 reads them.

wodSmtp   
http://www.weonlydo.com

wodSmtp is activeX client component used to deliver email messages directly to the server of the recepient, using SMTP protocol. It automatically finds appropriate server where message should be delivered, or uses SmartHost through Hostname property. It includes several one-line methods for sending entire email (including attachments). It can also load prepared messages (created with Outlook, Outlook Express or any other client..), reformat it, change it's properties and send automatically. *supports both blocking and non-blocking operations *Can Automatically deliver message directly to users SMTP server *Has included DNS client to resolve addresses and domain names *Supports authentication with the server *Provides powerful set of properties that relate to messages-no need for external parsers or creators *Events for all major operations *Supports UNICODE in message headers *Supports attachments with BASE64, Binhex4, Quoted-printable and UU encoding *Save and Load messages for multi-session usage *Royalty free licencing *Easy usage

MailBee SMTP   
http://www.afterlogic.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, SMIME, POP3 and IMAP4 components. Royalty-free distribution.

MailBee.NET SMTP   
http://www.afterlogic.com

MailBee.NET SMTP is a set of powerful and robust .NET component for composing, mail merge, and sending mail to SMTP servers, to IIS SMTP queue, or directly to end recipients (via DNS MX Lookup). Written in 100% managed C# code, MailBee.NET SMTP can be used in desktop, console and ASP.NET applications developed in C#/VB.NET/etc. The key features of the component: quick methods for sending mail with a single line of code; SMTP PIPELINING and other ESMTP extensions; secure TLS/SSL connections; secure and user-defined ESMTP authentication (including NTLM and POP-before-SMTP); Windows Integrated Authentication (authenticate using the current Windows user credentials); send to IIS SMTP queue; accurate and flexible MIME builder; compose HTML mails with embedded pictures; HTML-to-PlainText conversion and vice versa, alternative body generation; mail merge, send a web page, read and delivery receipt, Delivery Status Notifications; international charsets, UTF-8, TO/CC/BCC, custom headers, custom message formats (such as meeting request items); email address parsing and validation; multiple attachments, file and memory attachments; XML, streams, backup SMTP and DNS servers, multi-threading, asynchronous methods; track accepted and refused recipients; forward/resend mails loaded from a file or received with other components (such as MailBee.NET POP3); rich set of events and error handling features, memory and file logging, and much more; documentation is available in CHM, VS.NET 2003, and VS.NET 2005 formats; royalty-free distribution.