[DM-MUG] Email Return Receipt / Mail Read

[mauri booton]

I use Mail on my iMac. I would like to find a way to implement a  
"return receipt" or "mail read" using the mail software. I've read  
about some commercial services that provide this option, but I was  
wondering if it can be implemented without using a paid service that  
limits the number of emails that can be sent with the feature?

Any suggestions?

~~ mauri ~~