vanderblugen / send-emails-from-linux-with-postfix

Yet another way to configuring Linux to send emails using mailutils and postfix.

Send Emails from Linux with Postfix

This is for configuring Linux to be able to send emails.

This information was obtained from here for my enjoyment and so I don't have to look for this again. . This has been tested on a Raspbery pi and an Ubuntu machine.

This configuration uses Gmail as the email carrier. It will work with others, just used gmail in this configuration. Less secure apps or 2 factor with app passwords needs to be enabled for this configuration to work.

Install needed apps

sudo apt-get install postfix libsasl2-modules mailutils -y

Select internet site on installation

Add email password

sudo nano -B /etc/postfix/sasl/sasl_passwd

Add smtp.gmail.com:587 [email protected]:password with the appropriate information

Crtl+X' and Enter` to save and exit

Update the password file

sudo chmod u=rw,go= /etc/postfix/sasl/sasl_passwd
sudo postmap /etc/postfix/sasl/sasl_passwd

Edit postfix configuration file

sudo cp /etc/postfix/main.cf !#$.dist
sudo nano /etc/postfix/main.cf

Change relayhost = to relayhost = smtp.gmail.com:587

Change smtp_tls_security_level=may to #smtp_tls_security_level=may

Add this at the bottom

# Enable authentication using SASL.
smtp_sasl_auth_enable = yes
# Use transport layer security (TLS) encryption.
smtp_tls_security_level = encrypt
# Do not allow anonymous authentication.
smtp_sasl_security_options = noanonymous
# Specify where to find the login information.
smtp_sasl_password_maps = hash:/etc/postfix/sasl/sasl_passwd
# Where to find the certificate authority (CA) certificates.
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt

Exit and Save with Ctrl+X and Enter

Restart Postfix

sudo service postfix restart

Send a test email

echo "Subject: Test Email Subject" | mail -a [email protected] < echo "Here is a test email"