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Fatal error: Uncaught Swift_TransportException: Connection could not be established with host localhost :stream_socket_client(): unable to connect to localhost:25 (Connection refused) in /var/www/html/sykoradental-prod/project/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:261 Stack trace: #0 [internal function]: Swift_Transport_StreamBuffer->{closure}() #1 /var/www/html/sykoradental-prod/project/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php(264): stream_socket_client() #2 /var/www/html/sykoradental-prod/project/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php(58): Swift_Transport_StreamBuffer->establishSocketConnection() #3 /var/www/html/sykoradental-prod/project/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(143): Swift_Transport_StreamBuffer->initialize() #4 /var/www/html/sykoradental-prod/project/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mailer.php(65): Swift_Transport_AbstractSmtpTranspor in /var/www/html/sykoradental-prod/project/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php on line 261