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What is CDONTS and CDOSYS?

April 26, 2017cdonts cdosys

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What is CDONTS and CDOSYS?

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CDONTS is a library (component) provided as a part of IIS starting with Microsoft Windows NT 4.0 Server using Option Pack 1 up to and including Microsoft Windows 2000 Server. It works in conjunction with the Microsoft SMTP Service under the IIS Internet Information Manager console. CDONTS is a free component of IIS that lets you run an SMTP server on your website, or more to our point, provide a way for ASP applications to send SMTP email messages. CDONTS can be used in conjuncton with any existing SMTP server software on your (or your ISP’s) same network or server as IIS. CDONTS is being phased and replaced with the newer CDOSYS library. An enhanced version of the CDONTS library is also included and enabled as part of Exchange server. The CDONTS included with Exchange has significantly more functionality than what is included with IIS/Microsoft SMTP Service, however Exchange would be a bit overkill for use as just an SMTP server. CDOSYS is a library (component) provided as a part of I