How can I access my e-mail from another computer?

How can someone send a email from my email addy with out access to my computer and how can i find out where it?

• emails have been sent from my yahoo email addy that have not been sent from my home or ip addy how do i find out who has hacked into my yahho account and sending emails to make it look like me and how can i find out where they have come from

• Answer:

  They don't need access to your computer to hack your yahoo email account. They only need your password, for which there are machines that just keep trying every combination until they find the right one. Change your password and you should be fine.