there are many ways to send email from an asp page. you can either use third party components or microsoft CDONTS or MAPI etc.

to find info on CDONTS look into MSDN for NewMail object, you will get all info with related code.
for third party components you can search web for JMAIL, sendmail etc..
i've got one URL http://www.freevbcode.com/ShowCode.Asp?ID=109

better use CDONTS in asp pages !