ewsweb on "[Plugin: Contact Form 7] Failed to send your message - after updating CF7 to 3.4"

Hello,

I have this failed message when I tried to submit the form and it wont send the email.
"Failed to send your message. Please try later or contact the administrator by another method"

Any solutions will be appreciate.

Thank you
ews

http://wordpress.org/extend/plugins/contact-form-7/