This looks concerning: ErrorException: Email to [email protected] failed

• ErrorException: Email to [email protected] failed: [E_WARNING] proc_open() has been disabled for security reasons
• src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:304
• Generated by: Unknown account
• Dec 1, 2020 at 7:55 PM

Stack trace
#0 [internal function]: XF::handlePhpError(2, '[E_WARNING] pro...', '/home/...', 304, Array)
#1 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php(304): proc_open('/usr/sbin/sendm...', Array, Array)
#2 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php(58): Swift_Transport_StreamBuffer->_establishProcessConnection()
#3 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/SendmailTransport.php(119): Swift_Transport_StreamBuffer->initialize(Array)
#4 src/XF/Mail/Mailer.php(292): Swift_Transport_SendmailTransport->send(Object(Swift_Message), Array)
#5 src/XF/Mail/Queue.php(138): XF\Mail\Mailer->send(Object(Swift_Message), Object(Swift_SendmailTransport), Array)
#6 src/XF/Job/MailQueue.php(12): XF\Mail\Queue->run(G)
#7 src/XF/Job/Manager.php(253): XF\Job\MailQueue->run(G)
#8 src/XF/Job/Manager.php(195): XF\Job\Manager->runJobInternal(Array, G)
#9 src/XF/Job/Manager.php(79): XF\Job\Manager->runJobEntry(Array, G)
#10 job.php(42): XF\Job\Manager->runQueue(false, 8)
#11 {main}

Click to expand...

array(4) {
["url"] => string(14) "/forum/job.php"
["referrer"] => string(46) "https://www.xxxxxxx.com/forum/index.php"
["_GET"] => array(0) {
}
["_POST"] => array(0) {
}
}

Click to expand...