Kindly first remove the From email and empty it and then check the issue, also check that the input field name of the contact form fields is unique or not. If not then make them unique.
Hello,
similar issue with Pagelayer provided by default with my web host,
No subject and mail from wordpress@
I had to manually update :
www/XXX/cms/wp-includes/pluggable.php
MODIFIED:
if ( ! isset( $from_email ) ) {
// Get the site domain and get rid of www.
$sitename = wp_parse_url( network_home_url(), PHP_URL_HOST );
=> $from_email = 'alain@';