OpenSSL :: SSL :: SSLError ..... certificate verification failed?

Question

OpenSSL :: SSL :: SSLError ..... certificate verification failed?

I just upgraded to Rails 3.2.8and updated all my gems. I wanted to test my site, so I started by registering, but when I clicked the connect button, it gave me an error:

OpenSSL::SSL::SSLError in RegistrationsController#create

SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed

app/models/user.rb:28:in `send_welcome_email'

I am using Devise 2.1.2and this is my user model:

class User < ActiveRecord::Base
  attr_accessible :email, :password, :remember_me
  attr_accessor :accessible # something for devise i think
  devise :database_authenticatable, :registerable, 
  :recoverable, :rememberable, :trackable, 
  :validatable, :email_regexp =>  /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

  after_create :send_welcome_email

  private

  def send_welcome_email
    UserMailer.welcome_email(self).deliver
  end
end

I assume this has something to do with my email settings in my development.rb .

require 'tlsmail'
  Net::SMTP.enable_tls(OpenSSL::SSL::VERIFY_NONE)
  ActionMailer::Base.delivery_method = :smtp
  ActionMailer::Base.perform_deliveries = true
  ActionMailer::Base.raise_delivery_errors = true
  ActionMailer::Base.smtp_settings = {
    :enable_starttls_auto => true,
    :address            => 'smtp.gmail.com',
    :port               => 587,
    :tls                => true,
    :domain             => 'app.com',
    :authentication     => :plain,
    :user_name          => 'support@app.com',
    :password           => '******'
  }
  config.action_mailer.default_url_options = { :host => 'localhost:3000' }