Yahoo mail see if an email I've sent has been opened?

how do i transfer all of my email from yahoo without losing all of my mail

how can I verify my email address on yahoo.co.uk?..

how do I cancel my yahoo mail altogether?

If my friend is in another city can she see my messages on the yahoo messenger or not.

if I have a email in yahoo or msn can I open the spam or not any answer is welcome thank you.

How do I import contacts from a vcard file on the new yahoo mail?

Like putting in my e-mail and having every website associated with that e-mail pop up?

Every time that I go and try to read my emails, it is a blank page. I've exited out and opened a whole new page but each time...

sir/madam,, for last 10 hours.. when ever I am tying to open yahoomail messages its said bad request... or the page is shift...

I have at&t whats the number to like see how many texts you sent ? I know the minutes one is *646#