If you set email-related settings like these
email.smtp_host.secured=postfix email.smtp_port.secured=25 firstname.lastname@example.org email.prefix=[SONARQUBE6.7.6]
in the SonarQube 6.7.6 sonar.properties file and restart it, they are not displayed in the Settings menu. There you will find only the default values. However SonarQube is using the settings from the sonar.properties file internally, which can be checked by using the “configuration test” option in the “E-Mail” section of the settings menu.