Why does Net::SMTPAuthenticationError occur?

Question

gmail

Hello Toaster!
I'm trying to send an email via Rails, but I'm getting an error:

Net::SMTPAuthenticationError (534-5.7.14 <https://accounts.google.com/ContinueSignIn?sarp=1&scc=1&plt=AKgnsbvm6
):
  app/controllers/pages_controller.rb:11:in `send_email'

send_email:

def send_email
        @client = Client.new(user_params)
        if @client.save
            AppMailer.welcome_email(@client).deliver
        end
    end

Settings in Development.rb:

config.action_mailer.delivery_method = :smtp
  config.action_mailer.raise_delivery_errors = true
  ActionMailer::Base.smtp_settings = {
    :address        => 'smtp.gmail.com',
    :domain         => 'gmail.com',
    :port           => 587,
    :user_name      => 'мой_майл@gmail.com',
    :password       => 'пароль',
    :authentication => :plain,
    :enable_starttls_auto => true
  }

Here's more from the logs:

Sent mail to Куда@mail.ru (1407.7ms)
Date: Sat, 11 Oct 2014 21:10:53 +0400
From: Откуда@gmail.com
To: Куда@mail.ru
Message-ID: <[email protected]>
Subject: =?UTF-8?Q?=D0=97=D0=B0=D0=BA=D0=B0=D0=B7_45?=
Mime-Version: 1.0
Content-Type: text/html;
 charset=UTF-8
Content-Transfer-Encoding: base64

Access to the box opened

Answer 1

It looks like gmail saw some suspicious activity in this submission of yours.
Login to your gmail account. If I'm right, then he will ask you, they say, someone here tried to spam on your behalf, was it you or not?

Answer 2

You may need to change your security settings https://www.google.com/settings/security/lesssecureapps