mail from CmdLine Linux

First of all you need to install and configure Postfix to Use Gmail SMTP on Ubuntu.

Install all necessary packages:

$ sudo apt-get install postfix mailutils libsasl2-2 ca-certificates libsasl2-modules

If you do not have postfix installed before, postfix configuration wizard will ask you some questions. Just select your server as Internet Site and for FQDN use something like

Then open your postfix config file:

$ sudo gedit /etc/postfix/

and add following lines to it:

relayhost = []:587

smtp_sasl_auth_enable = yes

smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd

smtp_sasl_security_options = noanonymous

smtp_tls_CAfile = /etc/postfix/cacert.pem

smtp_use_tls = yes

You might have noticed that we haven’t specified our Gmail username and password in above lines. They will go into a different file. Open/Create:

$ sudo /etc/postfix/sasl_passwd

And add following line:


If you want to use your Google App’s domain, please replace with your

Fix permission and update postfix config to use sasl_passwd file:

$ sudo chmod 400 /etc/postfix/sasl_passwd

$ sudo postmap /etc/postfix/sasl_passwd

Next, validate certificates to avoid running into error. Just run following command:

$ cat /etc/ssl/certs/Thawte_Premium_Server_CA.pem | sudo tee -a /etc/postfix/cacert.pem

Finally, reload postfix config for changes to take effect:

$ sudo /etc/init.d/postfix reload

sudo cp /usr/share/ca-certificates/mozilla/*.* /usr/lib/ICAClient/keystore/cacerts/ 

sudo cp /usr/share/ca-certificates/mozilla/*.* /etc/ssl/certs/ 


** You have to go into Gmail's settings for this account and allow older apps to send mail. Gmail blocks these by default