How do I find the owner of a yahoo email address?

you can check IP who send u a email.. from yahoo!mail when you open one mail.. see under the right "Full Headers"-click- there you can find Who send u Email

How do I find the owner of a yahoo email address?
You can't, the only stuff you can find out is what that person has in their profile and is publicly viewed. If they're sending you stuff you don't want, or harassing you, block the address.

hi5