ssmtp.conf

#
# Config file for sSMTP sendmail
#
# The person who gets all mail for userids < 1000
# Make this empty to disable rewriting.
#root=postmaster

# The place where the mail goes. The actual machine name is required no 
# MX records are consulted. Commonly mailhosts are named mail.domain.com
#mailhub=mail

# Where will the mail seem to come from?
#rewriteDomain=

# The full hostname
#hostname=raspberrypi

# Are users allowed to set their own From: address?
# YES - Allow the user to specify their own From: address
# NO - Use the system generated From: address
#FromLineOverride=YES

root=<your-mail>@gmail.com
mailhub=smtp.gmail.com:587
AuthUser=<your-mail>@gmail.com
AuthPass=<pass>
UseSTARTTLS=YES