emails/api/setup/setups/01_emails.php

<?php
use Psr\Container\ContainerInterface;

return [
    Ddeboer\Imap\ServerInterface::class => function(ContainerInterface $container) {
        $emails = $container->get('emails');
        if (isset($emails->port)) {
            return new Ddeboer\Imap\Server($emails->host, $emails->port);
        }
        return new Ddeboer\Imap\Server($emails->host);
    },
    Ddeboer\Imap\ConnectionInterface::class => function(ContainerInterface $container) {
        $emails = $container->get('emails');
        $server = $container->get(Ddeboer\Imap\ServerInterface::class);
        return $server->authenticate($emails->username, $emails->password);
    },
    PDO::class => function(ContainerInterface $container) {
        $database = $container->get('database');
        $dsn = ["mysql:host={$database->host}"];
        if (isset($database->port)) {
            $dsn []= "port={$database->port}";
        }
        $dsn []= "dbname={$database->name}";
        $dsn = implode(';', $dsn);
        return new PDO($dsn, $database->user->name, $database->user->password);
    },
];