Can not send email by Mailer Rails - ruby-on-rails

Question

I have tried to configure like the tutorials but still can not send email. At the console, it displays the image below:
I have configured in config file \ environments \ development.rb and production.rb as follows:
config.active_record.dump_schema_after_migration = false
config.action_mailer.raise_delivery_errors = true
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
address: 'smtp.gmail.com',
port: 587,
domain: 'gmail.com',
user_name: 'gmail username',
password: 'password',
authentication: 'plain',
enable_starttls_auto: true }
app\mailers\user_mailer.rb:
class UserMailer < ApplicationMailer
def registration_confirmation(user)
mail(:to => user.email,:subject => "registered")
end
end
app\mailers\application_mailer.rb
class ApplicationMailer < ActionMailer::Base
default from: "testonebig#gmail.com"
layout 'mailer'
end
app\controllers\users_controller.rb
def create
#user = User.new(user_params)
UserMailer.registration_confirmation(#user).deliver
respond_to do |format|
if #user.save
format.html { redirect_to #user, notice: 'User was successfully created.' }
format.json { render :show, status: :created, location: #user }
else
format.html { render :new }
format.json { render json: #user.errors, status: :unprocessable_entity }
end
end
end
It runs without any mistakes have been displayed but when I checked gmail, it's not receive any mail.

Answer 1

Are you providing the correct email and password in your development.rb file?
One more thing:
You are sending email from this id "testonebig#gmail.com", please login with this email in gmail. Just to make sure that everything is ok with your account. May be some kind of issue in authentication with your account.