Intercept and Modify outgoing mail to hotmail

Snippet.php

<?php
//Snippet
add_filter('wp_mail', function ($args) {
    $domains_to_override = ['hotmail.com', 'outlook.com', 'live.com', 'msn.com']; // add/remove as needed
    $new_from_email      = 'no-reply@yourdomain.com';
    $new_from_name       = 'Your Site';

    // Normalize "to" into an array
    $recipients = is_array($args['to'])
        ? $args['to']
        : preg_split('/[,;]+/', (string) $args['to']);

    $should_override = false;

    foreach ($recipients as $addr) {
        $addr = trim($addr);
        // Extract the domain (works for "Name <email@domain>" and raw emails)
        if (preg_match('/<([^>]+)>|([^<\s]+)/', $addr, $m)) {
            $email  = strtolower($m[1] ?: $m[2]);
            $domain = substr(strrchr($email, '@'), 1);
            if ($domain && in_array($domain, $domains_to_override, true)) {
                $should_override = true;
                break;
            }
        }
    }

    if ($should_override) {
        // Normalize headers to array
        $headers = $args['headers'];
        if (!is_array($headers)) {
            $headers = strlen((string) $headers) ? preg_split("/\r\n|\n|\r/", (string) $headers) : [];
        }

        // Remove any existing From header so our value wins
        $headers = array_values(array_filter($headers, function ($h) {
            return stripos($h, 'From:') !== 0;
        }));

        // Set the new From (and optionally Reply-To)
        $headers[] = sprintf('From: %s <%s>', $new_from_name, $new_from_email);
        // $headers[] = 'Reply-To: Support <support@yourdomain.com>';

        $args['headers'] = $headers;
    }

    return $args;
}, 10, 1);