XF 2.0 Email error log

[maszd]

Hi,
i get lot this error on acp today, maybe anyone know what cause it:

    ErrorException: Email to user@gmail.com failed: [E_WARNING] stream_socket_enable_crypto(): SSL: Handshake timed out src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:94

    Generated by: Unknown account Jul 13, 2018 at 4:19 AM

Stack trace

#0 [internal function]: XF::handlePhpError(2, '[E_WARNING] str...', '/usr/share/ngin...', 94, Array)
#1 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php(94): stream_socket_enable_crypto(Resource id #5, true, 57)
#2 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/EsmtpTransport.php(313): Swift_Transport_StreamBuffer->startTLS()
#3 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(118): Swift_Transport_EsmtpTransport->_doHeloCommand()
#4 src/XF/Mail/Mailer.php(276): Swift_Transport_AbstractSmtpTransport->start()
#5 src/XF/Mail/Queue.php(65): XF\Mail\Mailer->send(Object(Swift_Message))
#6 src/XF/Job/MailQueue.php(11): XF\Mail\Queue->run(8)
#7 src/XF/Job/Manager.php(241): XF\Job\MailQueue->run(8)
#8 src/XF/Job/Manager.php(187): XF\Job\Manager->runJobInternal(Array, 8)
#9 src/XF/Job/Manager.php(76): XF\Job\Manager->runJobEntry(Array, 8)
#10 job.php(15): XF\Job\Manager->runQueue(false, 8)
#11 {main}

Request state

array(4) {
  ["url"] => string(8) "/job.php"
  ["referrer"] => string(24) "https://domain.com/"
  ["_GET"] => array(0) {
  }
  ["_POST"] => array(0) {
  }
}

thanks.