I had this issue on a new install yesterday. While it’s unlikely others have the same root problem I thought I’d share it just in case.
I was using name permalinks to refer to pages rather than index.php?p=123 yet I was using a 404 redirect to index.php in my Apache config without a .htaccess file to handle permalinks.
Everything else seemed to work fine albeit with “file not found” errors in my Apache error.log.
After a day of swearing at Contact Form 7 I finally put two and two together and created a proper .htaccess file to perform my permalink redirects and Contact Form 7 suddenly started to work. If you loko at your Apache error.log and notice file not found errors referring to your Contact Form page then I suggest tackling those.
To clarify, the issue I was experiencing was a constant spinning arrow next to the submit button with no email sent.
Cheers,
Neil.
