Lumen 5.3 send email

A little late to the party, but here's how I've done it in Lumen 5.4 (and I know it might be a little clumsy and not suitable for everyone, but still):

1) pull in illuminate/mail:

composer require illuminate/mail

2) add the service provider to your bootstrap/app.php:

$app->register(\Illuminate\Mail\MailServiceProvider::class); and uncomment $app->withFacades();

It's possible/likely the following can be achieved through .env but I haven't tried:

3) Install phanan's cascading config - https://github.com/phanan/cascading-config and follow the installation process for Lumen described there

4) create config folder in your application's root and copy-paste full Laravel's config/mail.php

5) add $app->configure('mail'); to bootstrap/app.php

6) make sure the actual config in mail.php is correct

Now you should be able to send mails the same way you do in full Laravel installation.