Forwarding ‘root’’s mail on Raspberry PI OS to gmail account

1.  Install ‘mailutils’, ‘postfix’ and ‘libsasl2-modules’ with:

sudo apt install mailutils postfix libsasl2-modules

2.  Edit “/etc/postfix/main.cf”

Change the line that reads “inet_interfaces = all” to “net_interfaces = loopback-only”

Change the line that reads “relayhost = “ to “relayhost = [smtp.gmail.com]:587”

  Add the lines:

smtp_use_tls = yes

  smtp_sasl_auth_enable = yes

  smtp_sasl_security_options =

  smtp_sasl_password_maps = hash:/etc/postfix/sasl/sasl_passwd

3.  Create the file “/etc/postfix/sasl/sasl_passwd” to enable authentication 

add the line “[smtp.gmail.com]:587    username@gmail.com:password”

The user address I use is an email account that I created especially for my computers to use as a ‘from’ address

4.  Run “sudo postmap /etc/postfix/sasl/sasl_passwd”

5.  Run “sudo systemctl restart postfix”

6.  To forward mail sent to ‘root’ I need to edit the ”/etc/aliases” file

sudo nano /etc/aliases 

add  “root: youremail@yourdomain.com” below the “postmaster:  root”  line.

7. Update the system’s aliases with “sudo newaliases”