submitMessage button in Contact-us form next page link

[@part]

At my site i have a standerd theme of presta addons working with version 1.6.1.5

When i go to the standerd contact page url.com/contact-us

I've added succesfully the phone and e-mail address altered the customer and webmasters name and discription.
And now testing the form, the generated mails go to the backoffice so that works.

But after clicking the send button the page go's to a http 500 error "could not load the page"
But the mail was sent and received in the backoffice.
The same in the backoffice while sending the e-mail also a http 500 error.
Here the customer doesn't get the send mail.

So a couple of issues apear.

I'm working with a different mailadres then the shop url, it is also integraded in GMail.

Could someone help me or shine a light for new perspective?

Thanks

Kind regards 

[rocky]

Try editing config/defines.inc.php and changing the value of _PS_DEV_MODE_ from false to true. You should then get an error message instead of a 500 error.