If you mean the content of the mail, you can't. You can only edit a mail by forwarding or replying.
One cant edit a sent inbox message on Facebook. One simply has to send an edited message and explain where the error came from. Facebook doesn't have a way to edit a sent inbox message as of yet.
in your mail
No, it will not disappear.
It's the inbox of the e-mail address you signed up with.
Inbox
in box
at my head
It's the inbox of the e-mail you signed up with.
You can just search for a specific type of e-mail in your inbox menu or the main e-mail menu and you will be able to search an e-mail by name, date or the other persons e-mail address..
Inbox
giuyoiyuopuo
Inbox is a folder, where you receive mails from different people. if you don't get the mail in inbox, it goes to junk or spam tab.