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vendor/swiftmailer/swiftmailer/doc/japanese.rst

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+Using Swift Mailer for Japanese Emails
+======================================
+
+To send emails in Japanese, you need to tweak the default configuration.
+
+Call the ``Swift::init()`` method with the following code as early as possible
+in your code::
+
+    Swift::init(function () {
+        Swift_DependencyContainer::getInstance()
+            ->register('mime.qpheaderencoder')
+            ->asAliasOf('mime.base64headerencoder');
+
+        Swift_Preferences::getInstance()->setCharset('iso-2022-jp');
+    });
+
+    /* rest of code goes here */
+
+That's all!