varbase_core-8.x-8.18/config/update/varbase_core_optional_update_8603.yml

__global_actions:
  install_modules:
    - swiftmailer
    - varbase_email
mailsystem.settings:
  expected_config:
    defaults:
      formatter: swiftmailer
      sender: swiftmailer
  update_actions:
    change:
      defaults:
        formatter: php_mail
        sender: php_mail
swiftmailer.message:
  expected_config:
    convert_mode: true
    format: text/html
    respect_format: false
  update_actions:
    change:
      convert_mode: false
      format: text/plain
      respect_format: true