composer require mailofly/mailofly

<?php

require 'vendor/autoload.php';

use Mailofly\Client;

$client = new Client(getenv('MAILOFLY_API_KEY'));

$result = $client->emails->send([
    'from' => 'Acme <onboarding@example.com>',
    'to' => ['you@example.com'],
    'subject' => 'Hello from Mailofly',
    'html' => '<p>It works!</p>',
]);

print_r($result['id']);

$client->mailLogs->list(['page' => 1, 'page_size' => 10]);