This plugin sets the PHPMailer Sender (return-path) the same as the From address if it』s not correctly set.
Mitigates the 「via」 and 「The actual sender of」 Notification in Outlook and stops email going to spam/junk because of the mismatch between From and Return-Path headers.
This usually occurs on shared hosting servers when local user / domain is used as default for the return-path header and WordPress only sets the From header.
