Contact Form 7 – 500 internal server error

Replies: 0

Hi there,

I got error 500 whenever I try to submit the form.
I have checked the error log and it showed PHP Fatal error:
Only variables can be passed by reference in /home/forceone/public_html/wp-includes/class-phpmailer.php – idn_to_ascii($domain, 0, INTL_IDNA_VARIANT_UTS46)

Any ideas?
Thanks.