From http://www.w3schools.com (Copyright Refsnes Data)

ASP Sending e-mail with CDOSYS

CDOSYS is a built-in component in ASP. This component is used to send e-mails with ASP.

Sending e-mail with CDOSYS

CDO (Collaboration Data Objects) is a Microsoft technology that is designed to simplify the creation of messaging applications.

CDOSYS is a built-in component in ASP. We will show you how to use this component to send e-mail with ASP.

How about CDONTs?

Microsoft has discontinued the use of CDONTs on Windows 2000, Windows XP and Windows 2003. If you have used CDONTs in your ASP applications, you should update the code and use the new CDO technology.

Examples using CDOSYS

Sending a text e-mail:

<%
Set myMail=CreateObject("CDO.Message")
myMail.Subject="Sending email with CDO"
myMail.From="[email protected]"
myMail.To="[email protected]"
myMail.TextBody="This is a message."
myMail.Send
set myMail=nothing
%>

Sending a text e-mail with Bcc and CC fields:

<%
Set myMail=CreateObject("CDO.Message")
myMail.Subject="Sending email with CDO"
myMail.From="[email protected]"
myMail.To="[email protected]"
myMail.Bcc="[email protected]"
myMail.Cc="[email protected]"
myMail.TextBody="This is a message."
myMail.Send
set myMail=nothing
%>

Sending an HTML e-mail:

<%
Set myMail=CreateObject("CDO.Message")
myMail.Subject="Sending email with CDO"
myMail.From="[email protected]"
myMail.To="[email protected]"
myMail.HTMLBody = "<h1>This is a message.</h1>" 
myMail.Send
set myMail=nothing
%>

Sending an HTML e-mail that sends a webpage from a website:

<%
Set myMail=CreateObject("CDO.Message")
myMail.Subject="Sending email with CDO"
myMail.From="[email protected]"
myMail.To="[email protected]"
myMail.CreateMHTMLBody "http://www.w3schools.com/asp/" 
myMail.Send
set myMail=nothing
%>

Sending an HTML e-mail that sends a webpage from a file on your computer:

<%
Set myMail=CreateObject("CDO.Message")
myMail.Subject="Sending email with CDO"
myMail.From="[email protected]"
myMail.To="[email protected]"
myMail.CreateMHTMLBody "file://c:/mydocuments/test.htm" 
myMail.Send
set myMail=nothing
%>

Sending a text e-mail with an Attachment:

<%
Set myMail=CreateObject("CDO.Message")
myMail.Subject="Sending email with CDO"
myMail.From="[email protected]"
myMail.To="[email protected]"
myMail.TextBody="This is a message."
myMail.AddAttachment "c:\mydocuments\test.txt"
myMail.Send
set myMail=nothing
%>

Sending a text e-mail using a remote server:

<%
Set myMail=CreateObject("CDO.Message")
myMail.Subject="Sending email with CDO"
myMail.From="[email protected]"
myMail.To="[email protected]"
myMail.TextBody="This is a message."
myMail.Configuration.Fields.Item _
("http://schemas.microsoft.com/cdo/configuration/sendusing")=2
'Name or IP of remote SMTP server
myMail.Configuration.Fields.Item _
("http://schemas.microsoft.com/cdo/configuration/smtpserver") _
="smtp.server.com"
'Server port
myMail.Configuration.Fields.Item _
("http://schemas.microsoft.com/cdo/configuration/smtpserverport") _
=25 
myMail.Configuration.Fields.Update
myMail.Send
set myMail=nothing
%>