title: How do you customize variables in Laravel default emails?
body: <p>I followed <a href="https://stackoverflow.com/a/42725231/2031033">this answer</a> to publish the default email templates in my application with: </p>
  
  <pre><code>php artisan vendor:publish --tag=laravel-notifications
  php artisan vendor:publish --tag=laravel-mail
  </code></pre>
  
  <p>This works great, but clearly there is some configuration options, such as:</p>
  
  <pre><code>{{-- Greeting --}}
  @if (! empty($greeting))
  # {{ $greeting }}
  @else
  @if ($level === 'error')
  # @lang('Whoops!')
  @else
  # @lang('Hello!')
  @endif
  @endif
  
  {{-- Salutation --}}
  @if (! empty($salutation))
  {{ $salutation }}
  @else
  @lang('Regards'),&lt;br&gt;{{ config('app.name') }}
  @endif
  </code></pre>
  
  <p>Right now my emails are sending "Hello!" and "Regards" from the else section but clearly there is a way to set these defaults for email templates using variables. How do I set the <code>$greeting</code> and <code>$salutation</code> variables when sending emails? </p>