diff --git a/lib/mail/attachments_list.rb b/lib/mail/attachments_list.rb
index 42e51c7fc..39d759210 100644
--- a/lib/mail/attachments_list.rb
+++ b/lib/mail/attachments_list.rb
@@ -106,5 +106,11 @@ def set_mime_type(filename)
       @mime_type && @mime_type.content_type
     end
 
+    # Recursively calls #[]= to merge a hash of attachments
+    def merge!(hash)
+      hash.each do |key, value|
+        self[key] = value
+      end
+    end
   end
 end
diff --git a/spec/mail/attachments_list_spec.rb b/spec/mail/attachments_list_spec.rb
index 04c6d59a2..fe08cd396 100644
--- a/spec/mail/attachments_list_spec.rb
+++ b/spec/mail/attachments_list_spec.rb
@@ -142,6 +142,20 @@ def check_decoded(actual, expected)
       expect(mail.attachments[3].filename).to eq 'test.zip'
     end
 
+    it "should allow you to merge a hash of attachments" do
+      mail = Mail.new
+      attachments = {
+        'test.pdf' => read_raw_fixture('attachments', 'test.pdf'),
+        'test.gif' => read_raw_fixture('attachments', 'test.gif'),
+        'test.jpg' => read_raw_fixture('attachments', 'test.jpg'),
+        'test.zip' => read_raw_fixture('attachments', 'test.zip')
+      }
+      mail.attachments.merge!(attachments)
+      expect(mail.attachments['test.pdf']).not_to be_nil
+      expect(mail.attachments['test.gif']).not_to be_nil
+      expect(mail.attachments['test.jpg']).not_to be_nil
+      expect(mail.attachments['test.zip']).not_to be_nil
+    end
   end
 
   describe "inline attachments" do