The Amazon EC2 BitNami stack servers are used for hosting e-commerce/web applications. BitNami stacks are ready to use virtual machines. Being an e-commerce/Web application, it will require functionality to send email from the server. One may receive below error in the Apache error log if Sendmail service is not present in the server.
/usr/bin/sendmail: not found
1) Install Sendmail service
sudo apt-get install sendmail
2) Verify Sendmail installation
whereis sendmail sendmail: /usr/sbin/sendmail /usr/lib/sendmail /usr/share/sendmail /usr/share/man/man8/sendmail.8.gz
3) Update Sendmail path in php.ini
sudo vi /opt/bitnami/php/etc/php.ini sendmail_path = /usr/sbin/sendmail -t -i -f root@your_server_hostname
4) Restart Apache service
sudo /opt/bitnami/ctlscript.sh restart apache2
5) Test by sending mail using mail command
echo "This is a test mail. Please do not reply" | mail -s Test Email firstname.lastname@example.org
If the mail arrives in your mail inbox then the mail service is working fine.
Note: It is advised to use smtp() function instead of mail() function for sending emails on the Amazon servers. This is because Amazon restricts the number of emails sent through mail() / Sendmail.
The smtp script can be found here.