I personally use very simple and lightweight package ssmtp. It will use any smtp server to send outbound emails. Install it by running:
sudo apt-get install ssmtp
/etc/ssmtp/ssmtp.conf file, comment out existing mailhub line and add the following lines (this example is for gmail smtp server):
mailhub=smtp.gmail.com:587 UseSTARTTLS=YES AuthUser=<YOUR-EMAIL>@gmail.com AuthPass=<YOUR-PASSWORD>
(Provide your gmail username & password. Of course you can use any other SMTP server).
Now make sure that your php.ini has correct
sendmail_path . It should read as:
sendmail_path = /usr/sbin/sendmail -t
( From comments of @dima-l and @omar-sabic : You do not have to specify
ssmtp here because the installation should have created a symlink for
/usr/sbin/sendmail , which correctly points to
ssmtp . Otherwise you have to specify
sendmail_path = /usr/sbin/ssmtp -t )
Reload apache and your php should be able to send outgoing emails now.