SMTPClient from Bossware lets developers add outgoing email capabilities to their Windows Forms and ASP.NET (Web Forms) email apps using the SMTP protocol. The component does not use the .NET System.Web.Mail namespace, which is simply a .NET Framework wrapper for CDONTS and CDOSYS, two Microsoft COM objects. One problem of using System.Web.Mail is that code using this namespace can behave differently depending on the OS of the computer it’s running on. CDONTS is also said to be resource-intensive and more complex to configure, and to have limitations, and even be unstable.

The component is written in 100% managed C# and is CLS compliant; therefore, developers can use the component in any .NET Framework programming language, such as C#, VB.NET, J#, ASP.NET, etc. It is a strong-named assembly so it can be used in cross-application development situations by registering it in the Global Assembly Cache (GAC).

With this control, developers can implement the following features:

• Sending HTML/text messages.
• Sending to multiple recipients.
• Connecting to multiple servers.
• Including multiple attachments.
• Connection retry count.
• Sending files using MIME encoding.
• Synchronized, thread-safe wrapper.
• Using message priority.

The component complies with several RFC (Request for Comment) documents concerning the SMTP protocol. However, it lacks logging and mail merge capabilities.

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