How can I tell if the other person has received my email?

I have a free yahoo account and so does the person I am sending the email to. How can I tell if they read or even received it?

I have received an email from Australia Lottery Inc. tell me that I has won the LOTTERY (200,000$.) I sent an email to person in email, then I'm known that it's scam. Hic hic :((. What will they do with my information? and what's happen for me?

I printed an email I received, in the From field, it only has the person's Name, and I need the email address. I would like it to have the format that the old yahoo had of: "Person's Name" <person's email address> Where do I change this...

forgot to put final line on first email so they emailed the second email which had final line on it; i am trying to add final line to first email and submitted question about this to yahoo questions people helped and said to open up first email and forward...

I know in some email programs, you can tell if the person you sent the email to has opened the email you have sent...Can you tell that in yahoo mail at all?

I TRY TO EMAIL SOMEONE AT 163.COM EMAIL AND ITS SEEM TO GO THROUGH, BUT THE OTHER PERSON DO NOT received ANY MAILS FROM ME?

Been getting scam emails from "monster.com", when tried to forward it to "siteabuse@monster.com" to report it, the email was never sent to "siteabuse@monster.com", but it was sent back to the scammer, which kept re-generating...

I have at times received emails but they are not meant for me. It appears that this person is Canadian. Received canceled orders from Amazon.com. Can yahoo look up my email address and verify that I am the only user?