dueclic

turboSMTP

Pro Mail SMTP

Enhance email deliverability with multiple SMTP providers, automatic failover, proactive alerts, analytics, and smart routing.

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 …

Pro Mail SMTP vs wp_mail return-path