SMTP
apt-get install msmtp-mta apt-get install mailutils apt-get install msmtp ca-certificates
/etc/mstmprc
defaults tls on tls_starttls on tls_trust_file /etc/ssl/certs/ca-certificates.crt account default host smtp.gmail.com port 587 auth on user myguiandroid@gmail.com password xyz from myguiandroid@gmail.com logfile /var/log/msmtp.log
test
echo "Subject: test\nthis is the body" | msmtp --debug --from=default -t mymail@gmail.com
cron
04 19 * * * echo "Subject: backup\n"$(rsnapshot daily) | msmtp --from=default -t mymail@gmail.com