How can I bring back my.old yahoo e/mail?

Steps for Yahoo Mail Recovery:

Sign in to your Yahoo mail account.

Go to each folder where all the important emails (inbox, spam, etc.) ...

Create a backup of all those emails and save them.

Scroll down to the Restore Yahoo Mail feature and click “Submit a restore request.”

one answer said to just sign in that did not work. the wrong e-mail address comes up not the old one

New email accounts set up by spam bots do NOT HAVE  old emails to recover. 

If it was not suspended or it has not been 12 months inactive, just sign in. Reset the password if you have forgotten it.

If it has been more than one year you won't be able to get it back. It no longer exists. Yahoo accounts are deleted after 12 months of inactivity if they aren't used in that time.