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vendor/symfony/mailer/Exception/UnsupportedSchemeException.php

@@ -44,6 +44,10 @@ class UnsupportedSchemeException extends LogicException
             'class' => Bridge\Mailjet\Transport\MailjetTransportFactory::class,
             'package' => 'symfony/mailjet-mailer',
         ],
+        'mailpace' => [
+            'class' => Bridge\MailPace\Transport\MailPaceTransportFactory::class,
+            'package' => 'symfony/mail-pace-mailer',
+        ],
         'mandrill' => [
             'class' => Bridge\Mailchimp\Transport\MandrillTransportFactory::class,
             'package' => 'symfony/mailchimp-mailer',

vendor/symfony/mailer/Transport/AbstractTransport.php

@@ -129,7 +129,7 @@ abstract class AbstractTransport implements TransportInterface
         $sleep = (1 / $this->rate) - (microtime(true) - $this->lastSent);
         if (0 < $sleep) {
             $this->logger->debug(sprintf('Email transport "%s" sleeps for %.2f seconds', __CLASS__, $sleep));
-            usleep($sleep * 1000000);
+            usleep((int) ($sleep * 1000000));
         }
         $this->lastSent = microtime(true);
     }