Why when I send out my yahoo address it goes into a hotmail address. I don't want to use any hotmail site.

My yahoo address is mg12182004@yahoo.com? My mail goes out that way and somehow it turns into, pegy2306@hotmail.com.? Why does it do that? I don't want to use the hotmail site, and I've taken it off everything. PLEASE HELP ME
Why when I send out my yahoo address it goes into a hotmail address. I don't want to use any hotmail site.
As you are composing you can change your From address now. Mine has a pull down menu to select from.