fixes #1651

app/logical/user_email_change.rb

@@ -0,0 +1,18 @@
+class UserEmailChange
+  attr_reader :user, :password, :new_email
+
+  def initialize(user, new_email, password)
+    @user = user
+    @new_email = new_email
+    @password = password
+  end
+
+  def process
+    if User.authenticate(user.name, password).nil?
+      false
+    else
+      user.email = new_email
+      user.save
+    end
+  end
+end