My system is debian8.1 ,sendmail has been installed.
I want to use the sendmail as a external gmail SMTP way to send mail .

Some article say "vi /etc/mail.rc" to add the following lines :

set from=yourname@gmail.com
set smtp=smtp.gmail.com
set smtp-auth-user=yourname
set smtp-auth-password=yourpasswd
set smtp-auth=login

There is no /etc/mail.rc in my filesystem.

ls  /etc/mail
access       helpfile      sendmail.cf       submit.cf
access.db    local-host-names  sendmail.conf     submit.mc
address.resolve  m4        sendmail.mc       tls
aliases      Makefile      service.switch    trusted-users
aliases.db   peers         service.switch-nodns
databases    sasl          smrsh

Which file will be chosen to add the lines?