diff --git a/.travis.yml b/.travis.yml
index d29fe8395..ccaa31ed9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,8 +21,7 @@ rvm:
   - ruby-head
   - jruby
   - jruby-head
-  - rbx-2
-  - rbx-3
+  - truffleruby
 
 env:
   global:
@@ -33,10 +32,16 @@ env:
     - MBCHARS=builtin
 
 matrix:
+  include:
+    - name: actionmailer
+      script: spec/travis-actionmailer.sh
+      rvm: 2.5
+      install: skip
+      env: BUNDLE_GEMFILE=$PWD/rails/Gemfile
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby
     - rvm: jruby-head
-    - rvm: rbx-2
-    - rvm: rbx-3
+    - rvm: truffleruby
+    - name: actionmailer
   fast_finish: true
diff --git a/spec/travis-actionmailer.sh b/spec/travis-actionmailer.sh
new file mode 100755
index 000000000..039c31c1f
--- /dev/null
+++ b/spec/travis-actionmailer.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -v -e
+
+rm -rf rails
+git clone --depth=1 https://github.com/rails/rails.git -b master
+cd rails
+echo "" >> Gemfile
+echo "gem 'mail', path: '../'" >> Gemfile
+rm -rf Gemfile.lock
+bundle install
+cd actionmailer
+bundle install
+bundle exec rake test
\ No newline at end of file