can't save /etc/ssmtp/ssmtp.conf

I have open my file with "sudo nano /etc/ssmtp/ssmtp.conf" and write

root=[e-mail]

mailhub=smtp.gmail.com:587

hostname=srvweb

AuthUser= [e-mail]
AuthPass=monbeauPaSsWoRd

FromLineOverride=YES

UseSTARTTLS=YES

but when want to save it says me that there is neither file nor folder

[Walter Roberson]

This question appears to refer to http://www.mathworks.com/help/supportpkg/raspberrypi/ug/configure-raspberry-pi-hardware-to-email-ip-address-changes.html

Could you confirm that you are executing that command on the Pi ? And could you confirm that your Raspberry Pi is configured with Raspbian Wheezy ?

[kilian canavate]

yes, I am executing that command on the pi and my pi is configure with wheezy