You can create a mail form in asp.

1. Create a html form which will get the values from the user.

For Example:
<form method="POST" action="email.asp">

To <input type="text" name="To">

From <input type="text" name="From">

Subject <input type="text" name="Subject">

Body <textarea name="Body" rows="5" cols="20" wrap="physical">

This form when submitted will be posted to a page called email.asp In the file email.asp we will get the submitted values and send it as email

<%
Dim objMail, objMailConf
Set objMail = Server.CreateObject("CDO.Message")
Set objMailConf = Server.CreateObject("CDO.Configuration")
objMailConf.Fields.item("http://schemas.microsoft.com/cdo/configuration/sendusing") = 2 '2 for web server
objMailConf.Fields.item("http://schemas.microsoft.com/cdo/configuration/smtpserverpickupdirectory") = "c:inetpubmailrootpickup"
objMailConf.Fields.item("http://schemas.microsoft.com/cdo/configuration/smtpserver") = "localhost"
objMailConf.fields.Item("http://schemas.microsoft.com/cdo/configuration/smtpserverport") = 25
objMailConf.Fields.item("http://schemas.microsoft.com/cdo/configuration/smtpconnectiontimeout") = 10
objMailConf.Fields.Update
Set objMail.Configuration = objMailConf
objMail.From = "someone@gmail.com"
objMail.To = Request.Form("To")
objMail.Subject = Request.Form("Subject")
objMail.TextBody = Request.Form("Body")
objMail.Fields.Update
objMail.Send
Set objMail = Nothing
Response.Write "Mail Sent Successfully"
%>