Feature/mx record validation

Gemfile

@@ -6,10 +6,10 @@ source "http://rubygems.org"
 # Add dependencies to develop your gem here.
 # Include everything needed to run rake, tests, features, etc.
 group :development do
-  gem "bundler", "~> 1.0.0"
-  gem "jeweler", "~> 1.5.2"  
+  gem "bundler"
+  gem "jeweler"
   gem 'simplecov', '>= 0.3.8', :require => false
-  gem "idn", :git => "git://github.com/mihu/idn.git"
-  gem "rspec", "~> 2.3.0"
-  gem "yard", "~> 0.6.0"
+  gem "rspec"
+  gem "yard"
+  gem "idn-ruby"
 end

lib/rails_email_validator.rb

@@ -24,6 +24,17 @@ def has_mx?(domain)
     not mx.nil? and mx.size > 0
   end
 
+
+  # validate if an a exists on domain
+  def has_a?(domain)
+    require 'resolv'
+    a = []
+    Resolv::DNS.open do |dns|
+      a = dns.getresources(domain, Resolv::DNS::Resource::IN::A)
+    end
+    not a.nil? and a.size > 0
+  end
+
   # convert an unicode domain_part to asccii for validation
   def convert_idn(domain_part)
     if allow_idn?
@@ -64,8 +75,18 @@ def validate_each(record, attribute, value)
       # check mx
       if valid and validate_mx?
         valid = false unless has_mx? domain_part
+
+        # check a
+        if !valid and validate_mx?
+          if has_a? domain_part
+            valid = true
+          end
+        end
+
       end
 
+
+
       # email valid
       record.errors.add(attribute, :invalid) unless valid
     end

spec/rails_email_validator_spec.rb

@@ -23,7 +23,8 @@ class ValidateDefaultEmail < ValidateEmail
       it "should validate without errors" do
         [
             '[email protected]',
-            '[email protected]'
+            '[email protected]',
+            '[email protected]',
         ].each do |email|
 
           @object.email = email