SMTP Username and Password for localhost

What Username and Password will be used when adding SMTP hosts for localhost.
As per the information given at here:
It shows “none” but when I am going to add SMTP host then it’s required Username and Password.
Need help to add it successfully.


Do you need a remote SMTP host (when you can use local one)?
Do you actually have a remote SMTP host? Then simply use the credentials for that host.