diff --git a/CHANGELOG.md b/CHANGELOG.md
index b57003d..e744a8b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 3.3.0
+
+- Delay loading of ActionMailer to fix support for `delivery_job` config (https://github.com/codetriage/maildown/pull/56)
+
 ## 3.2.0
 
 - Switch to "github style markdown" (https://github.com/codetriage/maildown/pull/54)
diff --git a/gemfiles/rails_5.gemfile.lock b/gemfiles/rails_5.gemfile.lock
index 769ab56..1c1d932 100644
--- a/gemfiles/rails_5.gemfile.lock
+++ b/gemfiles/rails_5.gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ..
   specs:
-    maildown (3.1.0)
+    maildown (3.2.0)
       actionmailer (>= 4.0.0)
       kramdown-parser-gfm
 
@@ -58,7 +58,7 @@ GEM
       activesupport (>= 4.2.0)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
-    kramdown (2.2.1)
+    kramdown (2.3.0)
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
diff --git a/gemfiles/rails_51.gemfile.lock b/gemfiles/rails_51.gemfile.lock
index cdab2d4..068b86b 100644
--- a/gemfiles/rails_51.gemfile.lock
+++ b/gemfiles/rails_51.gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ..
   specs:
-    maildown (3.1.0)
+    maildown (3.2.0)
       actionmailer (>= 4.0.0)
       kramdown-parser-gfm
 
@@ -58,7 +58,7 @@ GEM
       activesupport (>= 4.2.0)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
-    kramdown (2.2.1)
+    kramdown (2.3.0)
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
diff --git a/gemfiles/rails_52.gemfile.lock b/gemfiles/rails_52.gemfile.lock
index fe4653a..c3f51a7 100644
--- a/gemfiles/rails_52.gemfile.lock
+++ b/gemfiles/rails_52.gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ..
   specs:
-    maildown (3.1.0)
+    maildown (3.2.0)
       actionmailer (>= 4.0.0)
       kramdown-parser-gfm
 
@@ -62,7 +62,7 @@ GEM
       activesupport (>= 4.2.0)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
-    kramdown (2.2.1)
+    kramdown (2.3.0)
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
diff --git a/gemfiles/rails_6.gemfile.lock b/gemfiles/rails_6.gemfile.lock
index 7db9a46..b5a73f4 100644
--- a/gemfiles/rails_6.gemfile.lock
+++ b/gemfiles/rails_6.gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ..
   specs:
-    maildown (3.1.0)
+    maildown (3.2.0)
       actionmailer (>= 4.0.0)
       kramdown-parser-gfm
 
@@ -75,7 +75,7 @@ GEM
       activesupport (>= 4.2.0)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
-    kramdown (2.2.1)
+    kramdown (2.3.0)
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
diff --git a/gemfiles/rails_head.gemfile.lock b/gemfiles/rails_head.gemfile.lock
index d757c98..9bc5387 100644
--- a/gemfiles/rails_head.gemfile.lock
+++ b/gemfiles/rails_head.gemfile.lock
@@ -82,7 +82,7 @@ GIT
 PATH
   remote: ..
   specs:
-    maildown (3.1.0)
+    maildown (3.2.0)
       actionmailer (>= 4.0.0)
       kramdown-parser-gfm
 
@@ -101,7 +101,7 @@ GEM
       activesupport (>= 4.2.0)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
-    kramdown (2.2.1)
+    kramdown (2.3.0)
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
diff --git a/lib/maildown.rb b/lib/maildown.rb
index f566461..e103058 100644
--- a/lib/maildown.rb
+++ b/lib/maildown.rb
@@ -17,6 +17,10 @@ def self.rails_6?
 end
 
 require 'maildown/markdown_engine'
-require 'maildown/ext/action_mailer'
-require 'maildown/ext/action_view'
+ActiveSupport.on_load(:action_mailer) do
+  require 'maildown/ext/action_mailer'
+end
+ActiveSupport.on_load(:action_view) do
+  require 'maildown/ext/action_view'
+end
 require 'maildown/handlers/markdown'
diff --git a/lib/maildown/ext/action_mailer.rb b/lib/maildown/ext/action_mailer.rb
index 5a73cd1..cae3132 100644
--- a/lib/maildown/ext/action_mailer.rb
+++ b/lib/maildown/ext/action_mailer.rb
@@ -1,8 +1,5 @@
 # frozen_string_literal: true
 
-require 'action_mailer'
-require 'action_mailer/base'
-
 # Monkeypatch to allow mailer to auto generate text/html
 #
 # If you generate a mailer action, by default it will only
diff --git a/lib/maildown/ext/action_view.rb b/lib/maildown/ext/action_view.rb
index ccf65c9..9d680ee 100644
--- a/lib/maildown/ext/action_view.rb
+++ b/lib/maildown/ext/action_view.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'action_view'
-
 # This monkeypatch allows the use of `.md.erb` file extensions
 # in addition to `.md+erb` and `.md`
 module ActionView