The Catalyst Internet Mail .NET license permits the use of the .NET class library to build application software and redistribute that software to end-users. There are no restrictions on the number of products in which the class may be used. However, if it has been installed with an evaluation license, any products built using it cannot be redistributed to another system until a licensed copy of the toolkit has been purchased.
This software is designed for the Microsoft Windows platform using the .NET Framework 1.1 or later versions. For software development, it is supported on Windows Vista, Windows Server 2008, Windows Server 2003, Windows XP, and Windows 2000. It is recommended that all platforms have the current version of Internet Explorer installed, along with all service packs and critical updates.
For those applications created using the Catalyst Internet Mail .NET components, the appropriate class libraries (assemblies) must be distributed along with the application. The following component files should be included with your application:
| File Name | Description |
|---|---|
| SocketTools.InternetMail.dll | The InternetMail assembly which provides a client interface to the Post Office Protocol, Internet Message Access Protocol and Simple Mail Transfer Protocol. This assembly should be added as a reference in the project. |
| SocketTools.InternetDialer.dll | The InternetDialer assembly which provides an interface to the Remote Access Services API and is used to establish dial-up networking connections to the Internet. This assembly should be added as a reference in the project if required. |
| SocketTools.Interop.dll | The SocketTools core networking library. This library is shared by all of the SocketTools components, including the Internet Mail .NET class. This library should not be referenced directly in the project. |
| SocketTools.TraceLog.dll | The SocketTools debugging library used to generate trace log files which record the low-level networking functions called and the data exchanged. This library only needs to be distributed if the debugging features of the class are used. This library should not be referenced directly in the project. |
The Internet Mail .NET component has embedded information which provides version information to an installation utility. This information, called the version resource, specifies the assembly's version number among other things. If you are using a third-party or in-house installation program, it is extremely important that the program knows how to use this information. You should never overwrite a newer (higher) version of the Internet Mail .NET assembly with an older (lower) version or build number.
The Internet Mail .NET assembly and SocketTools core networking library should be installed in the same directory as the application executable on the target system. Note that you should not install the assembly in the Global Assembly Cache (GAC) or in the Windows system folder. If you are using the Trace related properties in your application, you should also include SocketTools.TraceLog.dll in your installation package.
The Internet Mail .NET assembly is given what is known as a "strong name", which means it has been signed with a cryptographic public/private key pair which ensures that the assembly has not been tampered with. However, if you are redistributing an updated version of the assembly, it requires that you also recompile your application and include it in the distribution. Unlike standard Windows dynamic link libraries, you cannot simply redistribute the assembly by itself because a strong-name signed assembly requires that the signature of the assembly, which includes the version number, match exactly what the application was built with. This is a feature in .NET designed to ensure that the application is using the correct version of the assembly.