Mailhog

Must use plugin

<?php
/**
 * Plugin Name: Local Email (MailHog)
 * Description: Routes all outgoing mail to the local MailHog SMTP server.
 * Author: LV2
 */

defined( 'ABSPATH' ) || exit;

add_action( 'phpmailer_init', function ( $phpmailer ) {
	$phpmailer->isSMTP();
	$phpmailer->Host        = '127.0.0.1';
	$phpmailer->Port        = 1025;
	$phpmailer->SMTPAuth    = false;
	$phpmailer->SMTPAutoTLS = false;
	$phpmailer->SMTPSecure  = '';
} );

// Sane sender so MailHog doesn't show wordpress@localhost everywhere.
add_filter( 'wp_mail_from', function () {
	return 'wordpress@' . wp_parse_url( home_url(), PHP_URL_HOST );
} );

add_filter( 'wp_mail_from_name', function () {
	return get_bloginfo( 'name' );
} );