For invalid email in ruby on rails debugging

App model

class User < ActiveRecord::Base
  	attr_accessible :email, :name, :password, :password_confirmation
  	has_secure_password

  	before_save{ self.email.downcase! }
  	
  	before_save { |user| user.email = email.downcase }	

 	  validates(:name, presence: true, length: { maximum: 50 } )
  
  	VALID_EMAIL_REGEX = /\A[\W+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  
  	validates :email, presence: true,
  					  format: { with: VALID_EMAIL_REGEX }, 
  				    uniqueness: { case_sensitive: false } 

  	validates :password, presence: true, length: { minimum: 6 }
  	validates :password_confirmation, presence: true
  

end

Try this
validates_format_of :email, :with => /\A[^@]+@([^@\.]+\.)+[^@\.]+\z/

Yes, bilal bhai successfully inserted.... Thanks alot :-)