Google Error - 535-5.7.8 Username and Password not accepted.

gistfile1.txt

Do simple these steps

1. After sign in your google account click on below your photo icon
       
        "Manage your Google Account"

2. then click on "security" tab.


3. Find "How you sign in to Google"

4. Then google need to on "2-Step Verification"

5. After do it by giving your account password. Go to bottom of page and find 

   "App passwords"

6. Click on "select app" in my case i select other and giving name "website".

7. The password will be generated, this will be your password for 
   configuration of smtp rather than your actual account password. 

        config.action_mailer.smtp_settings = {
          :address              => "smtp.gmail.com",
          :port                 => 587,
          :user_name            => 'your-email@gmail.com',
          :password             => 'google generated password',
          :authentication       => "plain",
          :enable_starttls_auto => true
        }

This will sure work!