probleme email avec mailgun fatal erreur

Fatal error: Uncaught Mailgun\Connection\Exceptions\MissingEndpoint: The endpoint you've tried to access does not exist. Check if the domain matches the domain you have configure on Mailgun. Domain not found: mg.uptraffic.fr in /var/www/uptraffic.fr/vendor/mailgun/mailgun-php/src/Mailgun/Connection/RestClient.php:258 Stack trace: #0 /var/www/uptraffic.fr/vendor/mailgun/mailgun-php/src/Mailgun/Connection/RestClient.php(110): Mailgun\Connection\RestClient->responseHandler(Object(GuzzleHttp\Psr7\Response)) #1 /var/www/uptraffic.fr/vendor/mailgun/mailgun-php/src/Mailgun/Connection/RestClient.php(179): Mailgun\Connection\RestClient->send('POST', 'mg.uptraffic.fr...', Object(GuzzleHttp\Psr7\Stream), Array) #2 /var/www/uptraffic.fr/vendor/mailgun/mailgun-php/src/Mailgun/Mailgun.php(204): Mailgun\Connection\RestClient->post('mg.uptraffic.fr...', Array, Array) #3 /var/www/uptraffic.fr/vendor/mailgun/mailgun-php/src/Mailgun/Mailgun.php(135): Mailgun\Mailgun->post('mg.uptraffic.fr...', Array, Array) #4 /var/www/uptraffic.fr/classes/ in /var/www/uptraffic.fr/vendor/mailgun/mailgun-php/src/Mailgun/Connection/RestClient.php on line 258