CliMail   
http://software.blizzard-media.com

CliMail is a set of command line utilities designed to send and receive email. CliSendmail sends email to recipients via the SMTP and SMTPS protocols. CliGetmail receives mail from either POP3, POP3S, IMAP or IMAPS mailboxes. CliMail works best in a scripting environment and has the following features. CliSendmail - send email from the command line, specify CC recipients, specify BCC recipients, send attachments, set delivery notification email address, send email through a firewall (set firewall host, user name, password and type), send HTML formatted messages, set importance level, add your own RFC 822 compliant headers, send mail through servers that require a login, send mail through servers that require CRAM-MD5 authentication mechanism, specify alternate port for an SMTP server, set the priority of an email message, set the reply to address, set the email address to send the read receipt to, send email through SMTPS servers. CliGetmail - check email from the command line, check email through a firewall (set firewall host, user name, password and type), check both POP3 and IMAP accounts, send plain text message, reply to a message, list all messages in a specified mailbox, display messages, delete a message, specify alternate mail server port, check email on POP3S or IMAPS servers.

wodPop3Server   
http://www.weonlydo.com

WeOnlyDo! COM Pop3Server ActiveX control is a component that can be easily integrated into your applications to provide full Pop3 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 RFC1939. Use your favorite mail client (such as Outlook Express or Eudora) to read mail provided by your own application. How? That's easy part: just put wodPop3Server 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 wodPop3Server. It will still work, and reject all the clients (with bad username/password error). But, if you add login capabilities using 'Connected' event (that's easy part - set Action = Allow for specific username/password combination). Still, if you want to make real Pop3 server application, look no more for native support for socket related material - you just found it. wodPop3Server will deal with clients and connections - you must deal with messages. Once new user logs on to your Pop3 server, you need to provide any kind of information about his mail. This is really easy task. If you keep all the emails in separate files, that's just great for usage with wodPop3Server. If you prefer to keep it in one large file - we will not argue about it. You can specify filename, starting and ending position for each email in mailbox, and WeOnlyDo! Pop3Server will pass it to remote client with ease. However, you might have some small problems maintaining such mailbox since sometimes it needs to delete messages, change status, etc.. But don't worry - it all can be done after user logs off.

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

The SocketTools Secure Library Edition includes standard Windows dynamic link libraries (DLLs) which can be used in a wide variety of programming languages such as Visual Studio.NET, Visual C++, Visual Basic and Delphi. The SocketTools Library Edition API has over 800 functions which can be used to develop applications that meet a wide range of needs. SocketTools covers it all, including uploading and downloading files, sending and retrieving email, remote command execution, terminal emulation, and much more. The SocketTools Secure Library Edition also 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. Your data is protected by industrial strength 128-bit encryption, with full support for client certificates. Using the popular SocketWrench library 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! The following protocols are supported by the SocketTools Secure Library Edition: Domain Name Service (DNS), File Encoding and Compression, File Transfer Protocol (FTPS), Finger Protocol, Gopher Protocol, Hypertext Transfer Protocol (HTTPS), Internet Control Message Protocol (ICMP), Internet Message Access Protocol (IMAPS), Multipurpose Internet Mail Extensions (MIME), Network News Transfer Protocol (NNTPS), Network Time Protocol, Post Office Protocol (POP3S), Remote Access Services (RAS), Remote Command Protocol, Simple Mail Transfer Protocol (SMTPS), Terminal Emulation, Telnet Protocol, Whois Porotocol, Windows Sockets (SocketWrench).

SocketTools Secure Subscription   
http://www.catalyst.com

The SocketTools Secure Subscription plan includes standard Windows dynamic link libraries (DLLs), ATL-based scripting components and ActiveX controls (OCXs) which can be used in a wide variety of programming languages such as Visual Studio.NET, Visual C++, Visual Basic and Delphi. This subscription plan is ideal for the developer who requires the high performance, minimum resource utilization and flexibility of a lower level interface, as well as the ease of use and rapid application development features of ActiveX components. The SocketTools API has over 800 functions and includes 35 components which can be used to develop applications that meet a wide range of needs. SocketTools covers it all, including uploading and downloading files, sending and retrieving email, remote command execution, terminal emulation, and much more. The SocketTools Secure Subscription also 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 libraries and components implement protocols such as HTTPS, 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!