Christof Moser

Actra SMTP is designed for simplicity and performance. It uses the native PHPMailer library included in WordPress core to route all emails through your preferred SMTP server.

Actra SMTP

A minimal, object-oriented SMTP plugin for WordPress with zero external dependencies.

barnz99

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.

wp_mail return-path

It still works and solves the issue it supposed to solve.

Working with WP 4.9.2

Simple plugin that correctly sets the return-path header when using wp_mail. Mitigates the "via" and "The actual sender of" Notif …

Actra SMTP vs wp_mail return-path