How to configure sendmail to send mail using an external gmail SMTP server?

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 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
access.db	 local-host-names  sendmail.conf
address.resolve  m4		 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?

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Hello, could to have you here at DO and that you are asking our community to help you out. But if you google out a bit you can find out alot yourself ;) For example check this tutorial:

If you got any more questions you cant work out, ill be happy to help you then.

done as the material say,think CrypticDesigns .