Postmarkapp is an excellent ESP (Email Service Provider). This package makes it possible to send your emails with Postmark without modifing your code.
Add this to your composer.json
"snowfire/mail": "dev-master"
Open app.php and remove this line:
Illuminate\Mail\MailServiceProvider
Add
Snowfire\Mail\MailServiceProvider
In your config file mail.php change your driver to postmark.
'driver' => 'postmark'
In your config file services.php add your postmark api key.
'postmark' => [
'api_key' => ''
],
Run a composer update and you are ready to go!