diff --git a/src/CommonMark/Extensions/Link/LinkRenderer.php b/src/CommonMark/Extensions/Link/LinkRenderer.php
index 767454762..bf0081e3a 100644
--- a/src/CommonMark/Extensions/Link/LinkRenderer.php
+++ b/src/CommonMark/Extensions/Link/LinkRenderer.php
@@ -111,6 +111,11 @@ private function isInternalLink(string $url): bool
             return true;
         }
 
+        // Emails
+        if (str_starts_with($url, 'mailto:')) {
+            return true;
+        }
+
         return false;
     }
 }
diff --git a/tests/CommonMark/Extensions/Link/LinkRendererTest.php b/tests/CommonMark/Extensions/Link/LinkRendererTest.php
index 214b64da9..2e15ac4ae 100644
--- a/tests/CommonMark/Extensions/Link/LinkRendererTest.php
+++ b/tests/CommonMark/Extensions/Link/LinkRendererTest.php
@@ -18,24 +18,31 @@
     $environment = new Environment();
     $environment->addRenderer(Text::class, new TextRenderer());
 
-    assertMatchesSnapshot((string) $subject->render(new Link($url, 'Label', 'Title'), new HtmlRenderer($environment)));
+    $element = $subject->render(new Link($url, 'Label', 'Title'), new HtmlRenderer($environment));
+
+    $this->expect($element->getAttribute('target'))->not->toBe('_blank');
+    assertMatchesSnapshot((string) $element);
 })->with([
     'https://ourapp.com',
     '#heading',
     '/path/segment',
+    'mailto:test@ark.io',
 ]);
 
-// it('should render external links', function (string $url) {
-//     $subject = new LinkRenderer();
-//     $subject->setConfiguration(new Configuration());
+it('should render external links', function (string $url) {
+    $subject = new LinkRenderer();
+    $subject->setConfiguration(new Configuration());
+
+    $environment = new Environment();
+    $environment->addRenderer(Text::class, new TextRenderer());
 
-//     $environment = new Environment();
-//     $environment->addRenderer(Text::class, new TextRenderer());
+    $element = $subject->render(new Link($url, 'Label', 'Title'), new HtmlRenderer($environment));
 
-//     assertMatchesSnapshot((string) $subject->render(new Link($url, 'Label', 'Title'), new HtmlRenderer($environment)));
-// })->with([
-//     'https://google.com',
-//     'unsupported/relative/url', // is valid, but currently not supported
-//     'ftp://google.com',
-//     '//google.com',
-// ]);
+    $this->expect($element->getAttribute('target'))->toBe('_blank');
+    assertMatchesSnapshot((string) $element);
+})->with([
+    'https://google.com',
+    'unsupported/relative/url', // is valid, but currently not supported
+    'ftp://google.com',
+    '//google.com',
+]);
diff --git a/tests/__snapshots__/LinkRendererTest__it_should_render_internal_links_with_(mailtotestark.io)__1.txt b/tests/__snapshots__/LinkRendererTest__it_should_render_internal_links_with_(mailtotestark.io)__1.txt
new file mode 100644
index 000000000..d3431b7be
--- /dev/null
+++ b/tests/__snapshots__/LinkRendererTest__it_should_render_internal_links_with_(mailtotestark.io)__1.txt
@@ -0,0 +1 @@
+<a href="mailto:test@ark.io" title="Title">Label</a>
\ No newline at end of file