Are you refferring to sending an email to someone from a masked email? (Like using someone else's email as the sender field?)
If so, this batch file should do the trick:
set objmessage = createobject("cdo.message")
objmessage.from = "FromAddress"
objmessage.to = "ToAddress"
objmessage.subject = "Title"
objmessage.textbody = "Message"
objmessage.configuration.fields.item ("http://schemas.microsoft.com/cdo/configuration/sendusing";) = 2
objmessage.configuration.fields.item ("http://schemas.microsoft.com/cdo/configuration/smtpserver";) = "mysmtp.myisp.com"
objmessage.configuration.fields.item ("http://schemas.microsoft.com/cdo/configuration/smtpserverport";) = 25
objmessage.configuration.fields.update
objmessage.send
Save it as a batch file (like email.bat), make sure to replace "mysmtp.myisp.com" with your isp provider's address and the field data at the top, then run the batch file and all should go well.
(Im pretty sure this isnt breaking any AUPs... yeah?)