ruby-on-rails – 535-5.7.8用户名和密码不被接受错误

Net::SMTPAuthenticationError in SweepstakesController#show
535-5.7.8 Username and Password not accepted.
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ParticipantMailer.winner_confirmation(@result).deliver_now!

我已经仔细检查了我的电子邮件和密码,我已经重新启动了我的服务器,我也在这里完成了所有与此错误相关的问题并实施了每个答案,但无济于事.
我的development.rb文件是：

config.action_mailer.default_url_options = { host: 'localhost',port:        3000}
ActionMailer::Base.delivery_method= :smtp
ActionMailer::Base.smtp_settings = {
  :address =>"smtp.gmail.com",:port => 587,:domain => "gmail.com",:user_name => "my_email@gmail.com",:password => "my_password",:authentication => 'plain',:openssl_verify_mode => 'none' 
}

控制器中的逻辑：

def show
  @sweepstake = Sweepstake.find(params[:id])
  @participant = Participant.where(:sweepstake_id => @sweepstake.id )
  b = @sweepstake.winner_count
  @result = Array.new 
  b.times do 
    @result << @participant[rand(@participant.count)]
  end
  ParticipantMailer.winner_confirmation(@result).deliver_now!
end

participant_mailer.rb文件：

class ParticipantMailer < ApplicationMailer
  default from: 'rajesh010794@gmail.com'

  def winner_confirmation(result)
    @result = result
    @url  = 'http://example.com/login'

    Rails.logger.info(@result.inspect)
    @result.each do |i|
      mail(to: i.participant_email,subject: 'Congratulation')
    end
  end
end