bedrock-env-mailer.php

<?php
/**
 * @author  Jeremy Sarda <jcsarda@gmail.com>
 * @note    If `WP_MAIL_SMTP_AUTH` is true it's assumed that the rest of the SMTP credentials exist.
 */
/*
 * Plugin Name: Bedrock Environment Mailer
 * Plugin URI: https://github.com/hackur/bedrock-env-mailer
 * Description: Use the pre-existing env() shortcut method to overwrite your PHPMailer connection details manually
 * through environment variables. Rewrote and forked https://github.com/aaemnnosttv/bedrock-mailtrap since it was
 * specific to mailtrap.io and I wanted to configure PHPMailer server credentials across multiple environments.
 * Version: 0.0.1
 * License: MIT
 * Author: Jeremy Sarda
 * Author URI: https://github.com/hackur
 * Text Domain: bedrock-env-mailer
 */

defined( 'ABSPATH' ) or die( 'This file cannot be visited directly.' );

if ( env( 'WP_MAIL_FROM' ) ) {

    add_filter( 'wp_mail_from', function () {
        return env( 'WP_MAIL_FROM' );
    } );

    add_filter( 'wp_mail_from_name', function () {
        return env( 'WP_MAIL_FROM_NAME' ) ? env( 'WP_MAIL_FROM_NAME' ) : 'WordPress Email System';
    } );

}

if ( env( 'WP_MAIL_SMTP_AUTH' ) ) {

    add_action( 'phpmailer_init', function ( PHPMailer $phpmailer ) {
        $phpmailer->isSMTP();
        $phpmailer->SMTPAuth   = true;
        $phpmailer->Username   = env( 'WP_MAIL_SMTP_USERNAME' );
        $phpmailer->Password   = env( 'WP_MAIL_SMTP_PASSWORD' );
        $phpmailer->Host       = env( 'WP_MAIL_SMTP_HOST' );
        $phpmailer->Port       = env( 'WP_MAIL_SMTP_PORT' );
        $phpmailer->SMTPSecure = env( 'WP_MAIL_SMTP_SECURE' );
        $phpmailer->SMTPDebug  = env( 'WP_MAIL_SMTP_DEBUG' );
    }, 999 );

}