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We've seen how to check Gmail using the terminal (shell) in Linux and Mac but how about sending emails from a shell?

This is actually pretty easy, here's what you have to do:

1. Install ssmtp. For Ubuntu, open a terminal and paste the following command:
sudo apt-get install ssmtp

2. Edit the ssmtp config file. Press Alt + F2 and type:
gksu gedit /etc/ssmtp/ssmtp.conf

If you don't use Gedit, replace it with your favourite text editor (kate, etc).
And paste this inside the ssmtp.conf file:
AuthUser=YOUR_GMAIL_USERNAME # (without @gmail.com)

And replace everything in capital letters with your credentials.

3. I use Ubuntu Karmic Koala and this step wasn't necessary, but it might be for you. So, make sure you don't have sendmail installed. Again, for Ubuntu, paste this:
sudo service sendmail stop
sudo apt-get remove sendmail

And create a symbolic link for ssmtp to replace sendmail:
sudo ln  -s /usr/sbin/ssmtp /usr/sbin/sendmail

4. That's about it. There are multiple ways you can now send an email. Open a terminal and:

echo "email content" | mail -s "email subject" email_address_to_send_email_to@somedomain.com

The above line is pretty much self explainatory so replace the text between the quotes with your email body and subject and do the same for email_address_to_send_email_to@somedomain.com - replace it with the email address you want to send the email to.

ssmtp email_address_to_send_email_to@somedomain.com

Then enter the following lines in the terminal (pressing ENTER after each line):
To: email_address_to_send_email_to@somedomain.com
From: your_email@gmail.com
Subject: this is your email subject

And here you can write the content of the email

And to send the email, press: CTRL + D

This time I won't explain what to replace, I hope you got the idea. Please note that you must follow the exact format as above, with an empty line between the email subject and the content of the email.

You can also send emails from a text file. Use the following command:
ssmtp email_address_to_send_email_to@somedomain.com < message.txt

Where message.txt must follow the exact same format like on point b) (above).

This has a lot of things it can be used for. You can set a cron job to email you different things at a given time, etc. I'm sure you can think of something you could use this for.

Important security note: as the password will be saved in plain text, I advise you not to use your main Gmail account. Instead, create one just for this.