Add support for Laravel 7 with backport for Laravel 5.x.

src/MailjetMailServiceProvider.php

@@ -4,27 +4,44 @@
 
 namespace Mailjet\LaravelMailjet;
 
+use Exception;
 use Illuminate\Mail\MailServiceProvider;
 use Mailjet\LaravelMailjet\Transport\MailjetTransport;
 use Swift_Events_SimpleEventDispatcher as EventDispatcher;
 
 class MailjetMailServiceProvider extends MailServiceProvider
 {
     /**
-     * Extended register the Swift Transport instance.
+     * Extended register the Illuminate Mailer instance.
      *
      * @return void
      */
-    protected function registerSwiftTransport(): void
+    protected function registerIlluminateMailer(): void
     {
-        parent::registerSwiftTransport();
+        parent::registerIlluminateMailer();
 
-        app('swift.transport')->extend('mailjet', function () {
-            $config = $this->app['config']->get('services.mailjet', []);
-            $call = $this->app['config']->get('services.mailjet.transactional.call', true);
-            $options = $this->app['config']->get('services.mailjet.transactional.options', []);
+        try{
+            app('mail.manager')->extend('mailjet', function () {
+                return $this->mailjetTransport();
+            });
+        } catch (Exception $e) {
+            app('swift.transport')->extend('mailjet', function () {
+                return $this->mailjetTransport();
+            });
+        }
+    }
+
+    /**
+     * Return configured MailjetTransport.
+     *
+     * @return \Mailjet\LaravelMailjet\Transport\MailjetTransport
+     */
+    protected function mailjetTransport(): MailjetTransport
+    {
+        $config = $this->app['config']->get('services.mailjet', []);
+        $call = $this->app['config']->get('services.mailjet.transactional.call', true);
+        $options = $this->app['config']->get('services.mailjet.transactional.options', []);
 
-            return new MailjetTransport(new EventDispatcher(), $config['key'], $config['secret'], $call, $options);
-        });
+        return new MailjetTransport(new EventDispatcher(), $config['key'], $config['secret'], $call, $options);
     }
 }