Javamail notification part

I want to know that how to ask the recipient send back an acknowledgement whether the mail hav been delivered or not?

i should call the recipient mail server to send back the acknowledgement or i need to write the code to ask for it.

if i need to write the code can someone teach me and guide me.

*Note: i already finish the javamail tutorial of the jguru.but i still cannot find the way to solve this.

regards,

albert

[455 byte] By [albert85a] at [2007-10-2 10:43:09]