There are many available asp mail components like persists software. The sample code for Persists AspEmail is as follows :

<%

strHost = "127.0.0.1"

If Request("Send") <> "" Then

Set Mail = Server.CreateObject("Persits.MailSender")
' enter valid SMTP host
Mail.Host = strHost

Mail.From = Request("From") ' From address
Mail.FromName = Request("FromName") ' optional
Mail.AddAddress Request("To")

' message subject
Mail.Subject = "Price List"
' message body
Mail.Body = Request("Body")

strErr = ""
bSuccess = False
' catch errors
On Error Resume Next
' send message
Mail.Send ' send message
If Err <> 0 Then ' error occurred
strErr = Err.Description
else
bSuccess = True
End If
End If
%>

If the body is in html format than use following keyword above :

Mail.IsHTML = True

To add an attachment append following sample code :

Mail.AddAddress Request("To")
' Attach two files in the same directory (any file type can be attached)
strPath = Server.MapPath(".")
Mail.AddAttachment strPath & "\ps_logo.gif"

A similar sample code in ASP.Net is as follows :

<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="ASPEMAILLib" %>
<%@ Import Namespace="System.Reflection" %>


<script runat="server" LANGUAGE="C#">

void Page_Load(Object Source, EventArgs E)
{
// Change this to your own SMTP server
String strHost = "127.0.0.1";

txtHost.InnerHtml = strHost;

if( IsPostBack )
{
// MailSender object declaration
ASPEMAILLib.IMailSender objMail;
objMail = new ASPEMAILLib.MailSender();

objMail.Host = strHost;

objMail.From = txtFrom.Value; // From address
objMail.FromName = txtFromName.Value; // optional

// To address, 2nd argument optional
objMail.AddAddress(txtTo.Value, Missing.Value);

// message subject
objMail.Subject = txtSubject.Value;

// message body
objMail.Body = txtBody.Value;

try
{
objMail.Send(Missing.Value);
txtMsg.InnerHtml = "<font color=green>Success! Message sent to " + txtTo.Value + ".</font>";
}
catch(Exception e)
{
txtMsg.InnerHtml = "<font color=red>Error occurred: " + e.Message + "</font>";
}
}
}

</script>