Add 'use warnings' (or its equivalents) to all modules, or convince us that your favorite module is well-known enough and people can easily see the modules warn when something bad happens.

Error: Mail::Audit, Mail::Audit::KillDups, Mail::Audit::MAPS, Mail::Audit::MailInternet, Mail::Audit::MimeEntity, Mail::Audit::Vacation

Add all modules contained in this distribution to the META.yml field 'provides'. Module::Build or Dist::Zilla::Plugin::MetaProvides do this automatically for you.