well, I fixed it with WP-Mail-SMTP plugin 🙂
I also tried to add define ('WPCF7_LOAD_JS', false); to wp-congig.php, but when I click on the send button it redirects me to non valid URL, for example http://domain.com/#wpcf7-f1279-p9-o1
hello, I don’t use any cache plugin, can anyone help me to get over this problem?