I have just installed tripwire using Ubuntu repos and have gone into the configuration files and changed everything to what I want. When in comes to the options for SMTP mail method and the server and port to use, I am stumped. When I run the test email I get this error message. /usr/sbin/tripwire --test --email blah@nowhere Sending a test message to: blah@nowhere ### Error: The SMTP connection could not be established. ### Server: localhost ### Exiting... Email test failed. I have made appropriate changes to the firewall. I don't have an smtp server installed. Do I need to? Any other ways I could use without installing an SMTP server due to security issues?