diff --git a/lib/sanitize_ext/sanitize_config.rb b/lib/sanitize_ext/sanitize_config.rb
index fed504cf2..c02de967b 100644
--- a/lib/sanitize_ext/sanitize_config.rb
+++ b/lib/sanitize_ext/sanitize_config.rb
@@ -56,18 +56,6 @@ class Sanitize
       end
     end
 
-    LINK_REL_TRANSFORMER = lambda do |env|
-      return unless env[:node_name] == 'a' and env[:node]['href']
-
-      node = env[:node]
-
-      rel = (node['rel'] || '').split(' ') & ['tag']
-      unless env[:config][:outgoing] && TagManager.instance.local_url?(node['href'])
-        rel += ['nofollow', 'noopener', 'noreferrer']
-      end
-      node['rel'] = rel.join(' ')
-    end
-
     UNSUPPORTED_HREF_TRANSFORMER = lambda do |env|
       return unless env[:node_name] == 'a'
 
@@ -98,6 +86,7 @@ class Sanitize
 
       add_attributes: {
         'a' => {
+          'rel' => 'nofollow noopener noreferrer',
           'target' => '_blank',
         },
       },
@@ -111,7 +100,6 @@ class Sanitize
         CLASS_WHITELIST_TRANSFORMER,
         IMG_TAG_TRANSFORMER,
         UNSUPPORTED_HREF_TRANSFORMER,
-        LINK_REL_TRANSFORMER,
       ]
     )
 
@@ -136,5 +124,48 @@ class Sanitize
         'source' => { 'src' => HTTP_PROTOCOLS }
       )
     )
+
+    LINK_REL_TRANSFORMER = lambda do |env|
+      return unless env[:node_name] == 'a' && env[:node]['href']
+
+      node = env[:node]
+
+      rel = (node['rel'] || '').split(' ') & ['tag']
+      rel += ['nofollow', 'noopener', 'noreferrer'] unless TagManager.instance.local_url?(node['href'])
+
+      if rel.empty?
+        node['rel']&.delete
+      else
+        node['rel'] = rel.join(' ')
+      end
+    end
+
+    LINK_TARGET_TRANSFORMER = lambda do |env|
+      return unless env[:node_name] == 'a' && env[:node]['href']
+
+      node = env[:node]
+      if node['target'] != '_blank' && TagManager.instance.local_url?(node['href'])
+        node['target']&.delete
+      else
+        node['target'] = '_blank'
+      end
+    end
+
+    MASTODON_OUTGOING ||= freeze_config MASTODON_STRICT.merge(
+      attributes: merge(
+        MASTODON_STRICT[:attributes],
+        'a' => %w(href rel class title target)
+      ),
+
+      add_attributes: {},
+
+      transformers: [
+        CLASS_WHITELIST_TRANSFORMER,
+        IMG_TAG_TRANSFORMER,
+        UNSUPPORTED_HREF_TRANSFORMER,
+        LINK_REL_TRANSFORMER,
+        LINK_TARGET_TRANSFORMER,
+      ]
+    )
   end
 end