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  All of the commercial XCENT web server application can be configured to use any one of the mail components outlined below. An Email component is required on the web server to allow the application to be able to send email messages to your site visitors. You change your configuration file to use the mail component of your choice. To verify which components are installed on your web server, you can use the XcDiag.ASP script. This will report which components are installed and additional details for certain components. Below is the list of supported components and some of our comments or opinions of these various components.
 
Microsoft CDONTS Provided as part of IIS 4.0 or later. Also known as the Microsoft SMTP service in IIS. There are actually two parts to this. The part that ASP scripts use is a COM component that allows your script to work with email. All the XCENT scripts use the CDONTS.NewMail object. The second part is actually a SMTP server. This part works just like any SMTP server software. It is a very basic SMTP server and does not have any good management tools. However, it does a very good job of sending email from within your ASP scripts. It can be configured to run with another SMTP package either on the same or different server. Because it queues up messages for delivery, it is very robust and efficient, even on busy servers.
Pros: Free component of IIS, efficient.
Cons: Lack of comprehensive documentation makes many wary of using it.
Include File: XcCDONTSlib.ASP
 
ASPEmail This is a commercial component from www.persits.com. It works similarly to other commercial products and is also very reliable. The basic version is free, and you can upgrade to a much enhanced version.
Pros: Free for limited version.
Cons: n/a
Include File: XcASPEmailLib.ASP
 
ASPMail This is a commercial component from www.serverobjects.com. It's a very robust and effective tool for sending Email from your ASP scripts. Very reliable and stable product.
Pros: Reliable and inexpensive.
Cons: n/a
Include File: XcASPMailLib.ASP
 
ASPQMail This is another commercial component from www.serverobjects.com that is an enhanced version of ASPMail. This is more than just a version of ASPMail with some additional features, as this product also performs email message queuing. Message queuing can significantly increase the speed, performance and reliability on busy servers and when sending to large mailing lists.
Pros: Great for heavily loaded servers and large mailing lists.
Cons: n/a
IncludeFile: XcASPQMailLib.ASP
 
BambooSMTP This is a component that seems to be used by some ISP's but does not seem to be generally available any longer.
Pros: Free
Cons: No future support.
Include File: XcBambooSMTPLib.ASP
 
JMail This is a freeware product from www.dimac.net . It seems to be a popular choice with some ISP's.
Pros: Free
Cons: n/a
Include File: XcJMailLib.ASP
 
SmartMail This is a freeware product from www.aspsmart.com.
Pros: Free
Cons: n/a
Include File: XcSmartMailLib.ASP
 
SmtpMail This is available from a commercial component vendor in both free and enhanced versions from www.softartisans.com.
Pros: Freeware version and Commericial Version with additional features.
Cons: n/a
Include File: XcSmartMailLib.ASP