No matter what contact form plugin I use, none of them work. I delete the plugin, empty cache, install a new one... and none of them work. They all say something like :
Failed to send your message. Please try later or contact the administrator by another method.
I've created a million WordPress sites with a million contact forms... there's nothing to it, but none of these are working. And I only have like 3 other plugins installed, shouldn't be anything conflicting.
What could the problem be?