Send email in ubuntu

1. Install

sudo apt-get install sendmail
sudo apt-get install sendmail-cf
sudo apt-get install mailutils

2. Check

ps aux | grep sendmail

3. Config

sudo vim /etc/mail/sendmail.mc

Change

DAEMON_OPTIONS(`Family=inet,Name=MTA-v4,Port=smtp,Addr=127.0.0.1')dnl

to

DAEMON_OPTIONS(`Family=inet,Addr=0.0.0.0')dnl

Backup config file

cd /etc/mail 
sudo mv sendmail.cf sendmail.cf.bak
sudo cp sendmail.mc sendmail.cf

4. Test

echo “hello,world” | mail -s topic [e-mail]