Update
The Hostfurl Mailform module has been withdrawn in favour of a greatly simplified template based approach at GitHub - hostfurl/minformhf: Website template starter with markdown and contact forms for Hostfurl · GitHub
The Hostfurl Mailform module has been withdrawn in favour of a greatly simplified template based approach at GitHub - hostfurl/minformhf: Website template starter with markdown and contact forms for Hostfurl · GitHub