diff --git a/.rubocop.yml b/.rubocop.yml
index 923ea00a106f2c763762ae7a0864a0434561191a..c1a5d06770fb78f2eaf648a72e8ab01f9c7147d4 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -60,7 +60,7 @@ Style/Attr:
 Style/BeginBlock:
   Description: 'Avoid the use of BEGIN blocks.'
   StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-BEGIN-blocks'
-  Enabled: false
+  Enabled: true
 
 Style/BarePercentLiterals:
   Description: 'Checks if usage of %() or %Q() matches configuration.'
@@ -101,12 +101,12 @@ Style/CaseIndentation:
 Style/CharacterLiteral:
   Description: 'Checks for uses of character literals.'
   StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-character-literals'
-  Enabled: false
+  Enabled: true
 
 Style/ClassAndModuleCamelCase:
   Description: 'Use CamelCase for classes and modules.'
   StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#camelcase-classes'
-  Enabled: false
+  Enabled: true
 
 Style/ClassAndModuleChildren:
   Description: 'Checks style of children classes and modules.'
@@ -124,7 +124,7 @@ Style/ClassMethods:
 Style/ClassVars:
   Description: 'Avoid the use of class variables.'
   StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-class-vars'
-  Enabled: false
+  Enabled: true
 
 Style/ColonMethodCall:
   Description: 'Do not use :: for method call.'
@@ -1000,3 +1000,4 @@ AllCops:
     - 'bin/**/*'
     - 'lib/backup/**/*'
     - 'lib/tasks/**/*'
+    - 'lib/email_validator.rb'
diff --git a/lib/email_validator.rb b/lib/email_validator.rb
index 0a67ebcd7959672cd617603235ae544dc84b5a5b..f509f0a584336fc0b3a1a5cccd36477eeb4c7fd4 100644
--- a/lib/email_validator.rb
+++ b/lib/email_validator.rb
@@ -1,5 +1,5 @@
 # Based on https://github.com/balexand/email_validator
-# 
+#
 # Extended to use only strict mode with following allowed characters:
 # ' - apostrophe
 #