The easiest way to send email is by using the CDOSYS component from Microsoft that is installed on your web server. Below is an example of ASP code to do that:

<%
'Dimension variables
Dim objCDOSYSCon

'Create the e-mail server object
Set objCDOSYSMail = Server.CreateObject("CDO.Message")
Set objCDOSYSCon = Server.CreateObject ("CDO.Configuration")

'Out going SMTP server
objCDOSYSCon.Fields("http://schemas.microsoft.com/cdo/configuration/smtpserver") = "mail.yoursite.com"

objCDOSYSCon.Fields("http://schemas.microsoft.com/cdo/configuration/smtpserverport") = 25

objCDOSYSCon.Fields("http://schemas.microsoft.com/cdo/configuration/sendusing") = 2

objCDOSYSCon.Fields("http://schemas.microsoft.com/cdo/configuration/smtpconnectiontimeout") = 60

objCDOSYSCon.Fields.Update

'Update the CDOSYS Configuration
Set objCDOSYSMail.Configuration = objCDOSYSCon

objCDOSYSMail.From = "you@yoursite.com"

objCDOSYSMail.To = "someone@theresite.com"

objCDOSYSMail.Subject = "Subject goes here"

objCDOSYSMail.HTMLBody = "html enhanced email message goes here"

objCDOSYSMail.Send

'Close the server mail object
Set objCDOSYSMail = Nothing
Set objCDOSYSCon = Nothing
%>

The full reference of CDO methods is available at the link below.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cdosys/html/_cdosys_imessage_interface.asp