pCoLaSD

holzhannes

This plugin configures WordPress and WordPress MU to use a SMTP server when sending emails instead of the default PHP <code>mail()</code> function.
You will configure your SMTP settings in your <code>wp-config.php</code> file instead of the settings page. 
The advantage is that no admin of your blog can read the settings. 
And you only have to place your settings once in cases of a WordPress MU installation.
A sample configuration:
<pre><code>/**
 * WordPress SMTP server
 */
define('WP_SMTP_HOST', 'mail.example.com');
define('WP_SMTP_PORT', 25); // obligatory - default: 25
define('WP_SMTP_ENCRYPTION', 'tls'); // obligatory ('tls' or 'ssl') - default: no encryption
define('WP_SMTP_USER', 'username'); // obligatory - default: no user
define('WP_SMTP_PASSWORD', 'password'); // obligatory - default: no password
define('WP_SMTP_FROM', 'John Doe <john.doe@example.com>'); // obligatory - default: no custom from address
define('WP_SMTP_REPLYTO', 'Jane Doe <jane.doe@example.com>'); // obligatory - default: no custom reply to address
</code></pre>

WP SMTP Config

Configure an external SMTP server in your config file.

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 …

WP SMTP Config vs wp_mail return-path