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Sometime you need to send notifications or simply you need to use sendmail command from your server, but you don't want to use a local mail server. Maybe use simple SMTP (ssmtp) could be a good idea to solve this kind of situations.
I use to configure SSMTP with a GMail account to send notifications from server different daemons, for example, crontab, supervisord, etc.
This is a cookbook configuration for SSMTP and GMail:
/etc/ssmtp/ssmtp.conf
root=user@gmail.com
mailhub=smtp.gmail.com:587
rewriteDomain=
hostname=user@gmail.com
UseSTARTTLS=YES
AuthUser=user@gmail.com
AuthPass=password
FromLineOverride=YES
/etc/ssmtp/revaliases
root:username@gmail.com:smtp.gmail.com:587
localusername:username@gmail.com:smtp.gmail.com:587
Installation in ubuntu server is as easy as: apt-get install ssmtp
