#0 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php(54): Swift_Transport_StreamBuffer->establishProcessConnection()
#1 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/SendmailTransport.php(117): Swift_Transport_StreamBuffer->initialize(Array)
#2 src/XF/Mail/Mailer.php(315): Swift_Transport_SendmailTransport->send(Object(Swift_Message), Array)
#3 src/XF/Mail/Queue.php(148): XF\Mail\Mailer->send(Object(Swift_Message), Object(Swift_SendmailTransport), Array)
#4 src/XF/Job/MailQueue.php(12): XF\Mail\Queue->run(7.96694)
#5 src/XF/Job/Manager.php(260): XF\Job\MailQueue->run(7.96694)
#6 src/XF/Job/Manager.php(202): XF\Job\Manager->runJobInternal(Array, 7.96694)
#7 src/XF/Job/Manager.php(86): XF\Job\Manager->runJobEntry(Array, 7.96694)
#8 job.php(43): XF\Job\Manager->runQueue(false, 8)
#9 {main}