Yahoo Mail does not have a delivery indication or the capability to request receipts. Some separate email programs can request a receipt but the person receiving the email must also have a compatible program and allow the receipt to be returned.
There are some web sites that give you a graphic to embed in your email and then they let you know if mail has been read. If someone blocks graphics from unknown people then it doesn't work.
Example: http://www.getnotify.com/
There are also sites where you must add their domain name to the end of the address and then they trace it for you.
Example: http://www.readnotify.com/
??????q *?*???*?
