class Honeybadger::ActionMailerSubscriber

def format_payload(payload)
  # Don't include the mail object in the payload...
  mail = payload.delete(:mail)
  # ... but do include any attachment filenames
  attachment_info = if mail&.attachments&.any?
    {attachments: mail.attachments.map { |a| {filename: a.filename} }}
  else
    {}
  end
  payload.merge(attachment_info)
end