diff --git a/resources/views/email_services/options/smtp.blade.php b/resources/views/email_services/options/smtp.blade.php
index f064bb0a..2ab3727c 100644
--- a/resources/views/email_services/options/smtp.blade.php
+++ b/resources/views/email_services/options/smtp.blade.php
@@ -2,4 +2,4 @@
 <x-sendportal.text-field type="number" name="settings[port]" :label="__('SMTP Port')" :value="Arr::get($settings ?? [], 'port')" />
 <x-sendportal.text-field name="settings[encryption]" :label="__('Encryption')" :value="Arr::get($settings ?? [], 'encryption')" />
 <x-sendportal.text-field name="settings[username]" :label="__('Username')" :value="Arr::get($settings ?? [], 'username')" />
-<x-sendportal.text-field type="password" name="settings[password]" :label="__('Password')" :value="Arr::get($settings ?? [], 'password')" />
\ No newline at end of file
+<x-sendportal.text-field type="password" name="settings[password]" :label="__('Password')" :value="Arr::get($settings ?? [], 'password')" />
diff --git a/src/Exceptions/MessageLimitReachedException.php b/src/Exceptions/MessageLimitReachedException.php
new file mode 100644
index 00000000..83592e31
--- /dev/null
+++ b/src/Exceptions/MessageLimitReachedException.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace Sendportal\Base\Exceptions;
+
+use Exception;
+
+class MessageLimitReachedException extends Exception
+{
+    //
+}
diff --git a/src/Http/Controllers/Campaigns/CampaignDispatchController.php b/src/Http/Controllers/Campaigns/CampaignDispatchController.php
index 38742e64..2763e672 100644
--- a/src/Http/Controllers/Campaigns/CampaignDispatchController.php
+++ b/src/Http/Controllers/Campaigns/CampaignDispatchController.php
@@ -10,7 +10,6 @@
 use Sendportal\Base\Facades\Sendportal;
 use Sendportal\Base\Http\Controllers\Controller;
 use Sendportal\Base\Http\Requests\CampaignDispatchRequest;
-use Sendportal\Base\Interfaces\QuotaServiceInterface;
 use Sendportal\Base\Models\CampaignStatus;
 use Sendportal\Base\Repositories\Campaigns\CampaignTenantRepositoryInterface;
 
@@ -19,17 +18,10 @@ class CampaignDispatchController extends Controller
     /** @var CampaignTenantRepositoryInterface */
     protected $campaigns;
 
-    /**
-     * @var QuotaServiceInterface
-     */
-    protected $quotaService;
-
     public function __construct(
-        CampaignTenantRepositoryInterface $campaigns,
-        QuotaServiceInterface $quotaService
+        CampaignTenantRepositoryInterface $campaigns
     ) {
         $this->campaigns = $campaigns;
-        $this->quotaService = $quotaService;
     }
 
     /**
@@ -56,11 +48,6 @@ public function send(CampaignDispatchRequest $request, int $id): RedirectRespons
 
         $campaign->tags()->sync($request->get('tags'));
 
-        if ($this->quotaService->exceedsQuota($campaign->email_service, $campaign->unsent_count)) {
-            return redirect()->route('sendportal.campaigns.edit', $id)
-                ->withErrors(__('The number of subscribers for this campaign exceeds your SES quota'));
-        }
-
         $scheduledAt = $request->get('schedule') === 'scheduled' ? Carbon::parse($request->get('scheduled_at')) : now();
 
         $campaign->update([
diff --git a/src/Interfaces/QuotaServiceInterface.php b/src/Interfaces/QuotaServiceInterface.php
index f347f538..d387ce35 100644
--- a/src/Interfaces/QuotaServiceInterface.php
+++ b/src/Interfaces/QuotaServiceInterface.php
@@ -6,5 +6,5 @@
 
 interface QuotaServiceInterface
 {
-    public function exceedsQuota(EmailService $emailService, int $messageCount): bool;
+    public function hasReachedMessageLimit(EmailService $emailService): bool;
 }
diff --git a/src/Listeners/MessageDispatchHandler.php b/src/Listeners/MessageDispatchHandler.php
index e70233e4..915dfe34 100644
--- a/src/Listeners/MessageDispatchHandler.php
+++ b/src/Listeners/MessageDispatchHandler.php
@@ -6,11 +6,15 @@
 
 use Exception;
 use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Queue\InteractsWithQueue;
 use Sendportal\Base\Events\MessageDispatchEvent;
+use Sendportal\Base\Exceptions\MessageLimitReachedException;
 use Sendportal\Base\Services\Messages\DispatchMessage;
 
 class MessageDispatchHandler implements ShouldQueue
 {
+    use InteractsWithQueue;
+
     /** @var string */
     public $queue = 'sendportal-message-dispatch';
 
@@ -27,6 +31,10 @@ public function __construct(DispatchMessage $dispatchMessage)
      */
     public function handle(MessageDispatchEvent $event): void
     {
-        $this->dispatchMessage->handle($event->message);
+        try {
+            $this->dispatchMessage->handle($event->message);
+        } catch (MessageLimitReachedException $e) {
+            $this->release();
+        }
     }
 }
diff --git a/src/Services/Messages/DispatchMessage.php b/src/Services/Messages/DispatchMessage.php
index 584cdaf4..c60321b8 100644
--- a/src/Services/Messages/DispatchMessage.php
+++ b/src/Services/Messages/DispatchMessage.php
@@ -6,6 +6,8 @@
 
 use Exception;
 use Illuminate\Support\Facades\Log;
+use Sendportal\Base\Exceptions\MessageLimitReachedException;
+use Sendportal\Base\Interfaces\QuotaServiceInterface;
 use Sendportal\Base\Models\Campaign;
 use Sendportal\Base\Models\CampaignStatus;
 use Sendportal\Base\Models\EmailService;
@@ -30,18 +32,23 @@ class DispatchMessage
     /** @var MarkAsSent */
     protected $markAsSent;
 
+    /** @var QuotaServiceInterface */
+    protected $quotaService;
+
     public function __construct(
         MergeContentService $mergeContentService,
         MergeSubjectService $mergeSubjectService,
         ResolveEmailService $resolveEmailService,
         RelayMessage $relayMessage,
-        MarkAsSent $markAsSent
+        MarkAsSent $markAsSent,
+        QuotaServiceInterface $quotaService
     ) {
         $this->mergeContentService = $mergeContentService;
         $this->mergeSubjectService = $mergeSubjectService;
         $this->resolveEmailService = $resolveEmailService;
         $this->relayMessage = $relayMessage;
         $this->markAsSent = $markAsSent;
+        $this->quotaService = $quotaService;
     }
 
     /**
@@ -58,11 +65,13 @@ public function handle(Message $message): ?string
         $message = $this->mergeSubject($message);
 
         $mergedContent = $this->getMergedContent($message);
-
         $emailService = $this->getEmailService($message);
-
         $trackingOptions = MessageTrackingOptions::fromMessage($message);
 
+        if ($this->quotaService->hasReachedMessageLimit($emailService)) {
+            throw new MessageLimitReachedException;
+        }
+
         $messageId = $this->dispatch($message, $emailService, $trackingOptions, $mergedContent);
 
         $this->markSent($message, $messageId);
diff --git a/src/Services/QuotaService.php b/src/Services/QuotaService.php
index a5fe6361..90d6ae1e 100644
--- a/src/Services/QuotaService.php
+++ b/src/Services/QuotaService.php
@@ -12,11 +12,11 @@
 
 class QuotaService implements QuotaServiceInterface
 {
-    public function exceedsQuota(EmailService $emailService, int $messageCount): bool
+    public function hasReachedMessageLimit(EmailService $emailService): bool
     {
         switch ($emailService->type_id) {
             case EmailServiceType::SES:
-                return $this->exceedsSesQuota($emailService, $messageCount);
+                return $this->exceedsSesQuota($emailService);
 
             case EmailServiceType::SENDGRID:
             case EmailServiceType::MAILGUN:
@@ -34,7 +34,7 @@ protected function resolveMailAdapter(EmailService $emailService): BaseMailAdapt
         return app(MailAdapterFactory::class)->adapter($emailService);
     }
 
-    protected function exceedsSesQuota(EmailService $emailService, int $messageCount): bool
+    protected function exceedsSesQuota(EmailService $emailService): bool
     {
         $mailAdapter = $this->resolveMailAdapter($emailService);
 
@@ -60,8 +60,6 @@ protected function exceedsSesQuota(EmailService $emailService, int $messageCount
 
         $sent = Arr::get($quota, 'SentLast24Hours');
 
-        $remaining = (int)floor($limit - $sent);
-
-        return $messageCount > $remaining;
+        return $sent >= $limit;
     }
 }
diff --git a/src/Traits/MocksSesMailAdapter.php b/src/Traits/MocksSesMailAdapter.php
new file mode 100644
index 00000000..b0e14bfc
--- /dev/null
+++ b/src/Traits/MocksSesMailAdapter.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Sendportal\Base\Traits;
+
+use Aws\Sdk;
+use Aws\Ses\SesClient;
+
+trait MocksSesMailAdapter
+{
+    /*
+     * We need to mock the SES mail adapter for tests that could cause QuotaService::hasReachedMessageLimit()
+     * to be called to prevent any attempt to query the API.
+     */
+    protected function mockSesMailAdapter(int $quota = null, int $sent = 0): void
+    {
+        $sendQuota = [];
+
+        if ($quota) {
+            $sendQuota = [
+                'Max24HourSend' => $quota,
+                'SentLast24Hours' => $sent,
+            ];
+        }
+
+        $sesClient = $this->getMockBuilder(SesClient::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $sesClient->method('__call')->willReturn(collect($sendQuota));
+
+        $aws = $this->getMockBuilder(Sdk::class)->getMock();
+        $aws->method('createClient')->willReturn($sesClient);
+
+        $this->app->singleton('aws', function () use ($aws) {
+            return $aws;
+        });
+    }
+}
diff --git a/tests/Feature/Messages/MessagesControllerTest.php b/tests/Feature/Messages/MessagesControllerTest.php
index 98bf0b78..998b48d5 100644
--- a/tests/Feature/Messages/MessagesControllerTest.php
+++ b/tests/Feature/Messages/MessagesControllerTest.php
@@ -8,12 +8,21 @@
 use Sendportal\Base\Facades\Sendportal;
 use Sendportal\Base\Models\Campaign;
 use Sendportal\Base\Models\Message;
+use Sendportal\Base\Traits\MocksSesMailAdapter;
 use Tests\TestCase;
 
 class MessagesControllerTest extends TestCase
 {
+    use MocksSesMailAdapter;
     use RefreshDatabase;
 
+    public function setUp(): void
+    {
+        parent::setUp();
+
+        $this->mockSesMailAdapter();
+    }
+
     /** @test */
     public function the_index_of_sent_messages_is_accessible_to_an_authenticated_user()
     {
diff --git a/tests/Unit/Services/QuotaServiceTest.php b/tests/Unit/Services/QuotaServiceTest.php
index 96b5b06e..09117f2d 100644
--- a/tests/Unit/Services/QuotaServiceTest.php
+++ b/tests/Unit/Services/QuotaServiceTest.php
@@ -4,15 +4,19 @@
 
 namespace Tests\Unit\Services;
 
-use Aws\Sdk;
-use Aws\Ses\SesClient;
+use Sendportal\Base\Exceptions\MessageLimitReachedException;
 use Sendportal\Base\Interfaces\QuotaServiceInterface;
+use Sendportal\Base\Models\Campaign;
 use Sendportal\Base\Models\EmailService;
 use Sendportal\Base\Models\EmailServiceType;
+use Sendportal\Base\Models\Message;
+use Sendportal\Base\Traits\MocksSesMailAdapter;
 use Tests\TestCase;
 
 class QuotaServiceTest extends TestCase
 {
+    use MocksSesMailAdapter;
+
     /** @var QuotaServiceInterface */
     protected $quotaService;
 
@@ -24,75 +28,79 @@ public function setUp(): void
     }
 
     /** @test */
-    public function fewer_subscribers_than_quota_available()
+    public function ses_message_limit_has_not_been_reached()
     {
         // given
         $emailService = EmailService::factory()->create(['type_id' => EmailServiceType::SES]);
 
-        $this->mockMailAdapter(2);
+        $this->mockSesMailAdapter(2);
 
         // then
-        self::assertFalse($this->quotaService->exceedsQuota($emailService, 1));
+        self::assertFalse($this->quotaService->hasReachedMessageLimit($emailService));
     }
 
     /** @test */
-    public function more_subscribers_than_quota_available()
+    public function ses_message_limit_has_been_reached()
     {
         // given
         $emailService = EmailService::factory()->create(['type_id' => EmailServiceType::SES]);
 
-        $this->mockMailAdapter(1);
+        $this->mockSesMailAdapter(1, 1);
 
         // then
-        self::assertTrue($this->quotaService->exceedsQuota($emailService, 2));
+        self::assertTrue($this->quotaService->hasReachedMessageLimit($emailService));
     }
 
     /** @test */
-    public function send_quota_not_available()
+    public function ses_message_limit_quota_not_available()
     {
         // given
         $emailService = EmailService::factory()->create(['type_id' => EmailServiceType::SES]);
 
-        $this->mockMailAdapter();
+        $this->mockSesMailAdapter();
 
         // then
-        self::assertFalse($this->quotaService->exceedsQuota($emailService, 1));
+        self::assertFalse($this->quotaService->hasReachedMessageLimit($emailService));
     }
 
     /** @test */
-    public function unlimited_quota()
+    public function ses_message_limit_unlimited_quota()
     {
         // given
         $emailService = EmailService::factory()->create(['type_id' => EmailServiceType::SES]);
 
-        $this->mockMailAdapter(-1);
+        $this->mockSesMailAdapter(-1);
 
         // then
-        self::assertFalse($this->quotaService->exceedsQuota($emailService, 1));
+        self::assertFalse($this->quotaService->hasReachedMessageLimit($emailService));
     }
 
-    protected function mockMailAdapter(int $quota = null): void
+    /** @test */
+    public function a_message_limit_reached_exception_is_thrown()
     {
-        $sendQuota = [];
+        // given
+        $emailService = EmailService::factory()->create(['type_id' => EmailServiceType::SES]);
 
-        if ($quota) {
-            $sendQuota = [
-                'Max24HourSend' => $quota,
-                'SentLast24Hours' => 0,
-            ];
-        }
+        $campaign = Campaign::factory()->create(
+            [
+                'email_service_id' => $emailService->id,
+                'workspace_id' => $emailService->workspace_id,
+                'content' => 'test',
+            ]
+        );
 
-        $sesClient = $this->getMockBuilder(SesClient::class)
-            ->disableOriginalConstructor()
-            ->getMock();
+        $message = Message::factory()->create(
+            [
+                'source_id' => $campaign->id,
+                'workspace_id' => $emailService->workspace_id,
+            ]
+        );
 
-        $sesClient->method('__call')->willReturn(collect($sendQuota));
+        $this->mockSesMailAdapter(1, 1);
 
-        $aws = $this->getMockBuilder(Sdk::class)->getMock();
-        $aws->method('createClient')->willReturn($sesClient);
+        $this->withoutExceptionHandling()
+            ->expectException(MessageLimitReachedException::class);
 
-        $this->app->singleton('aws', function () use ($aws) {
-            return $aws;
-        });
+        $this->post(route('sendportal.messages.send'), ['id' => $message->id]);
     }
 }