While I’m testing a mail, its showing an error: There was a problem while sending a test email. Related debugging output is shown below:
Versions: WordPress: 4.8.7 WordPress MS: No PHP: 7.0.32-0ubuntu0.16.04.1 WP Mail SMTP: 1.2.5
Params: Mailer: mail Constants: No
Server: PHP.mail(): Yes Apache.mod_security: No