Setting maximum send out email

There was a strange request recently. I had to maximize the sending emails given per day. Every email after should not be sent. I understand that with the help of this the client can keep email sending budget in control... but come on... 

So here are the steps, how I made it:

Add a new block to the EventServiceProvider. We will connect to the MessageSending event:

// app/Providers/EventServiceProvider.php

\Illuminate\Mail\Events\MessageSending::class => [
   EmailMessageSendingListener::class,
],

Create the `EmailmessageSendingListener.php`, I commented in the code, so I think it will self explanatory.

// inside EmailmessageSendingListener.php

// We don't want to typehint the event right now, however we could.

public function handle(object $event)
{
    // KEY CONTAINS CURRENT DATE ALSO
    $key = date('Y-m-d');
    $todaysRecord = DB::table('email_sent_quotas')->where('date', $key)->first();
    $count = 0;
    // CREATE A CACHE KEY FOR THE EMAIL SENT AND INCREMENT IT IF EXISTS
    if (! $todaysRecord) {
        DB::table('email_sent_quotas')->insert(['date' => $key, 'count' => 1]);
        $count = 1;
    } else {
        // INCREMENT HERE, SO WE WILL NOW IF THEY ARE EXCEED THE QUOTA AND HOW MUCH
        DB::table('email_sent_quotas')->where('date', $key)->increment('count', 1);
        $count = $todaysRecord->count + 1;
    }

    // GET THE TRESHOLD FROM THE CONFIG FILE
    $threshhold = config('interreg-danube.max_emails_per_day');

    if ($count > $threshhold) {
        return false;
    }

}

As you can see, it uses a database table. You can use Redis also. However I don't suggest Cache, becase in case you clear the cache, you will loose this tracked data also.

Now create a new migration and paste the content from here:

/**
* Run the migrations.
*/
public function up(): void
{
    Schema::create('email_sent_quotas', function (Blueprint $table) {
        $table->id();
        $table->date('date')->useCurrent();
        $table->unsignedInteger('count')->default(0);
    });
}

/**
* Reverse the migrations.
*/
public function down(): void
{
    Schema::dropIfExists('email_sent_quotas');
}