gothw

Founded the issue in contact-form-7/includes/submission.php. (line 203)

private function spam() {
		$spam = false;

		$user_agent = (string) $this->get_meta( 'user_agent' );

		if ( strlen( $user_agent ) < 2 ) {
			$spam = true;
		}

		if ( WPCF7_VERIFY_NONCE && ! $this->verify_nonce() ) {
			$spam = true;
		}

		if ( $this->blacklist_check() ) {
			$spam = true;
		}

		return apply_filters( 'wpcf7_spam', $spam );
	}

In my case, if i change $spam value to false in blacklist_check the mail is sent.

Now i need to know what blacklist i need to check.