Akismet::disable_moderation_emails_if_unreachable() – If Akismet is temporarily unreachable, we don’t want to "spam" the blogger with moderation emails for comments that will be automatically cleared or spammed on the next retry.
Akismet::is_test_mode() – To disable the Akismet comment nonce, add a filter for the ‘akismet_comment_nonce’ tag and return any string value that is not ‘true’ or ” (empty string).
