composer require lettr/lettr-laravel

php artisan vendor:publish --tag=lettr-config

LETTR_API_KEY=your-api-key

use Illuminate\Support\Facades\Mail;
use App\Mail\WelcomeEmail;

Mail::to('recipient@example.com')->send(new WelcomeEmail());

use Lettr\Facades\Lettr;

Lettr::emails()->send([
    'from' => 'you@example.com',
    'to' => ['recipient@example.com'],
    'subject' => 'Hello from Lettr',
    'html' => '<p>Welcome to Lettr!</p>'
]);

php artisan make:mail WelcomeEmail

<?php

namespace App\Mail;

use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;

class WelcomeEmail extends Mailable
{
    use Queueable, SerializesModels;

    public function build()
    {
        return $this
            ->subject('Welcome to Our App')
            ->view('emails.welcome');
    }
}

Mail::to('recipient@example.com')->queue(new WelcomeEmail());