Broken plugin?

Hi!

So i’ve been using Contact form 7 one several sites, and it’s always been working perfect, so big thanks!

I’m having an issue now then where none of my forms are working, and it seems as its affecting all forms. I had two forms on my site. I tried adjusting one of them to have two email recipients, and whilst doing that they both stopped working. I cant really see why since i didnt change anything exept for the “to” options under Email. Now i only get a message saying that the mail couldnt be sent and that i should contact the administrator in another way.

They both where working earlier. I also tried updating the plugin, uninstalling and installing again, twice. But still it doesnt work. What can be wrong and how do i resolve this?

https://ww.wp.xz.cn/plugins/contact-form-7/