If you see the system successfully logging the email messages within OJS, you will need to check with your system administrator or hosting provider for whatever you are using as the email routing within config.inc.php. For example, if SMTP is off, then check with the administrator of your OJS server. If SMTP is on, check with the administrator of your SMTP server. If the administrator confirms that mail is being routed successfully through the local mailserver, check if the mail is being flagged as spam for the recipient. If so, check your configuration to ensure you are complying with SPF, DMARC, and DKIM standards: