[Plugin: Contact form 7]: Not working – no mail, no success message

Hi!

I’ve been using this plugin for my sites but, for some reason, it stopped working on one of them. Now it doesn’t send emails, neither shows the success message, nothing happens, just displays the form.

I have installed the latest versions of both wordpress and plugin, still does not work.

Check the web page here: https://dulceremedio.com/pastilleros.

Thanks!