[1] MKDoc::Text::Structured - search.cpan.org ( ()) <http://search.cpan.org/dist/MKDoc-Text-Structured/lib/MKDoc/Text/Structured.pm>
[2] Plain text emails converted to HTML - SendGrid Documentation | SendGrid ( (SendGrid著, )) <https://sendgrid.com/docs/Classroom/Build/Format_Content/plain_text_emails_converted_to_html.html>