Sendmail

For sending only mail you can install instead of postfix:

sudo apt-get exim4

sudo dpkg-reconfigure exim4-config

For sending only mail using external SMTP you can use:

sudo apt-get install ssmtp

sudo vi /etc/ssmtp/ssmtp.conf

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


# 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
#mailhub=smtp.gmail.com:587
mailhub=smtps.aruba.it:465

[email protected]
AuthPass=passowrdveaa
UseTLS=yes
UseSTARTTLS=NO

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

# The full hostname
#hostname=MyMediaServer.home
hostname=XXaldeaglobal.net


# 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

Testing sending mails

echo "This is a test.3" | mail -s Testing1 [email protected]