```ruby
require 'redmine/version'
require 'redmine_audit/advisory'
require 'redmine_audit/database'

desc <<-END_DESC
Check redmine vulnerabilities.

Available options:
  * users    => comma separated list of user/group ids who should be notified

Example:
  rake redmine:bundle_audit users="1,23, 56" RAILS_ENV="production"
END_DESC

namespace :redmine do
  # Avoid to define same task twice.
  # TODO: stop load twice this .rake file.
  if !Rake::Task.task_defined?(:audit)
    task audit: :environment do
      users = (ENV['users'] || '').split(',').each(&:strip!)
      if users.empty?
        raise 'need to specify environment variable: users'
      end

      # TODO: More better if requires mailer automatically.
      require_dependency 'mailer'
      require_relative '../../app/models/mailer.rb'

      redmine_ver = Redmine::VERSION
      advisories = RedmineAudit::Database.new.advisories(redmine_ver.to_s)
      if advisories.length > 0
        Mailer.with_synched_deliveries do
          Mailer.unfixed_advisories_found(redmine_ver, advisories, users).deliver
        end
      end
    end
  end
end
```

Fix typo on `$ bundle exec rake -D audit`.
user
```ruby
require 'redmine/version'
require 'redmine_audit/advisory'
require 'redmine_audit/database'

desc <<-END_DESC
Check redmine vulnerabilities.

Available options:
  * users    => comma separated list of user/group ids who should be notified

Example:
  rake redmine:audit users="1,23, 56" RAILS_ENV="production"
END_DESC

namespace :redmine do
  # Avoid to define same task twice.
  # TODO: stop load twice this .rake file.
  if !Rake::Task.task_defined?(:audit)
    task audit: :environment do
      users = (ENV['users'] || '').split(',').each(&:strip!)
      if users.empty?
        raise 'need to specify environment variable: users'
      end

      # TODO: More better if requires mailer automatically.
      require_dependency 'mailer'
      require_relative '../../app/models/mailer.rb'

      redmine_ver = Redmine::VERSION
      advisories = RedmineAudit::Database.new.advisories(redmine_ver.to_s)
      if advisories.length > 0
        Mailer.with_synched_deliveries do
          Mailer.unfixed_advisories_found(redmine_ver, advisories, users).deliver
        end
      end
    end
  end
end
```
assistant