On WordPress 4.6 i've resolved this bug with this temporary fix:
open file wp-includes/pluggable.php
search for line:
Code: Select all
$phpmailer->setFrom( $from_email, $from_name );
Code: Select all
if(stristr(PHP_OS, 'win') === FALSE) {
$phpmailer->setFrom( $from_email, $from_name );
} else {
$phpmailer->setFrom( $from_email, $from_name, false );
}