Have you checked PHP error log?
Yes, I have seen on access_log:
[12/Aug/2014:14:30:24 +0000] “POST / HTTP/1.1” 500 –
but nothing on error_log 🙁
btw, I am using WP3.9.2 on ubuntu ec2 instance
In addition, I have removed the “contact-form-7/” folder and reinstalled cf7, retained all my settings but with same error!
I am getting the same error… everything worked fine and then after a couple updates it no longer allows me to submit. I get a server 500 error as well. I have disabled all plugins except for contact 7 with the same resulting error.
[Error] Failed to load resource: the server responded with a status of 500 (Internal Server Error) (underground.net, line 0)
http://underground.net scroll down to contact form
I found the problem and the solution. I had upgraded Easy WP SMTP plugin and it lost all its settings (a noted problem with this last update), which is why Contact 7 could no longer send. Went in and added back the settings in Easy SMTP and all is good.
I am also getting same error on all my websites running on WP 3.9.2 hosted with Godaddy. If I update any 3.9.1 site to 3.9.2, it also starts displaying 500 Internal Server Error after some time.
Still having this problem!
Upgraded to WP 4.0, CF7 3.9.3
Got WP-Mail-SMTP configured with gmail account, test email works great.
When submitting I get Server error 500:
HTTP/1.0 500 Internal Server Error
Date: Sun, 07 Sep 2014 13:03:22 GMT
Server: Apache
X-Powered-By: PHP/5.4.17
Content-Length: 0
Connection: close
Content-Type: text/html
Pragma: no-cache
Cache-Control: no-store, no-cache, must-revalidate, max-age=0
Expires: Tue, 01 Jan 1971 02:00:00 GMT
Is there anything else I can try/test?
Thanks in advance,
Ellie.