OJS version 3.3.0.11 installed not sending notification and emails to users

Description of issue or problem I’m having:
i have the latest OJS installed through cpanel, everytime a new article is submitted is returns error messages that email cannot be sent and i should contact the system administrator.

Steps I took leading up to the issue:

What I tried to resolve the issue:
i have contacted the hosting company and they said everything is working fine at their own end

Application Version - e.g., OJS 3.1.2:

OJS version 3.3.0.11

Additional information, such as screenshots and error log messages if applicable:
this is the error log from php mailer:
[20-Jun-2022 11:37:02 Africa/Lagos] ojs2: 404 Not Found
[20-Jun-2022 11:38:50 Africa/Lagos] PHP Warning: escapeshellcmd() has been disabled for security reasons in /home/njhstcom/journal.njhst.com.ng/lib/pkp/lib/vendor/phpmailer/phpmailer/src/PHPMailer.php on line 1729
[20-Jun-2022 11:38:50 Africa/Lagos] Could not instantiate mail function.
[20-Jun-2022 11:38:50 Africa/Lagos] Invalid address: (From): root@localhost