XF 2.3 Please help: Emails will not send (Fresh Install)

[nakedzombo]

Information: I had emails setup and working for the past year on my Xenforo 2 forums to my knowledge the dedicated machine or forums has not been recently updated, They recently all of a sudden stopped working and no longer will send emails. I have tried using Gmail, Outlook, mxRoute email providers with no luck of fixing the issue. I have tried even a fresh clean install of Xenforo 2 and even with a fresh install the error still occurs.

I would be willing to pay someone if they are able to help me resolve this issue as it's something I desperately need resolved.

System Specs:

• Running on Ubuntu 20.04
• Running CPanel / WHM to host the Xenforo 2 software.
• Running Cloudflare SSL Full Origin Strict policy to protect the domain with proper SSL.
• Running on PHP 8.1 currently and running the latest build of Xenforo 2 (Clean Install)
• I am also running Promox on this dedicated machine with CPanel/WHM under a VM

Note: I am the hosting provider, We host CPANEL/WHM on our own dedicated machine.

Server Error log:​

Symfony\Component\Mailer\Exception\TransportException: Email to s.davis@gameservershub.com from s.davis@gameservershub.com failed: Unable to connect with STARTTLS: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed src/vendor/symfony/mailer/Transport/Smtp/Stream/SocketStream.php:171

Stack Trace:​

#0 [internal function]: Symfony\Component\Mailer\Transport\Smtp\Stream\SocketStream->Symfony\Component\Mailer\Transport\Smtp\Stream\{closure}(2, 'stream_socket_e...', '/home/gameserve...', 174)
#1 src/vendor/symfony/mailer/Transport/Smtp/Stream/SocketStream.php(174): stream_socket_enable_crypto(Resource id #146, true)
#2 src/vendor/symfony/mailer/Transport/Smtp/EsmtpTransport.php(115): Symfony\Component\Mailer\Transport\Smtp\Stream\SocketStream->startTLS()
#3 src/vendor/symfony/mailer/Transport/Smtp/SmtpTransport.php(253): Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport->doHeloCommand()
#4 src/vendor/symfony/mailer/Transport/Smtp/SmtpTransport.php(194): Symfony\Component\Mailer\Transport\Smtp\SmtpTransport->start()
#5 src/vendor/symfony/mailer/Transport/AbstractTransport.php(72): Symfony\Component\Mailer\Transport\Smtp\SmtpTransport->doSend(Object(Symfony\Component\Mailer\SentMessage))
#6 src/vendor/symfony/mailer/Transport/Smtp/SmtpTransport.php(136): Symfony\Component\Mailer\Transport\AbstractTransport->send(Object(Symfony\Component\Mailer\SentMessage), Object(Symfony\Component\Mailer\DelayedEnvelope))
#7 src/XF/Mail/Mailer.php(305): Symfony\Component\Mailer\Transport\Smtp\SmtpTransport->send(Object(Symfony\Component\Mime\Email))
#8 src/XF/Mail/Mail.php(576): XF\Mail\Mailer->send(Object(Symfony\Component\Mime\Email), Object(Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport))
#9 src/XF/Admin/Controller/ToolsController.php(312): XF\Mail\Mail->send(Object(Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport), false)
#10 src/XF/Mvc/Dispatcher.php(362): XF\Admin\Controller\ToolsController->actionTestEmail(Object(XF\Mvc\ParameterBag))
#11 src/XF/Mvc/Dispatcher.php(265): XF\Mvc\Dispatcher->dispatchClass('XF:Tools', 'TestEmail', Object(XF\Mvc\RouteMatch), Object(XF\Admin\Controller\ToolsController), NULL)
#12 src/XF/Mvc/Dispatcher.php(121): XF\Mvc\Dispatcher->dispatchFromMatch(Object(XF\Mvc\RouteMatch), Object(XF\Admin\Controller\ToolsController), NULL)
#13 src/XF/Mvc/Dispatcher.php(63): XF\Mvc\Dispatcher->dispatchLoop(Object(XF\Mvc\RouteMatch))
#14 src/XF/App.php(2826): XF\Mvc\Dispatcher->run()
#15 src/XF.php(806): XF\App->run()
#16 admin.php(15): XF::runApp('XF\\Admin\\App')
#17 {main}

Request State:​

array(4) {
  ["url"] => string(38) "/testforums/admin.php?tools/test-email"
  ["referrer"] => string(64) "https://gameservershub.com/testforums/admin.php?tools/test-email"
  ["_GET"] => array(1) {
    ["tools/test-email"] => string(0) ""
  }
  ["_POST"] => array(2) {
    ["_xfToken"] => string(8) "********"
    ["email"] => string(26) "s.davis@gameservershub.com"
  }
}

Spoiler: Images