diff --git a/migrations/Version20240519140526.php b/migrations/Version20240519140526.php
new file mode 100644
index 0000000..121d08b
--- /dev/null
+++ b/migrations/Version20240519140526.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20240519140526 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE admin_membership_application ADD has_sent_initial_email TINYINT(1) DEFAULT 0 NOT NULL');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE admin_membership_application DROP has_sent_initial_email');
+    }
+}
diff --git a/src/Controller/MemberController.php b/src/Controller/MemberController.php
index 6a4cd6b..82ce9d4 100644
--- a/src/Controller/MemberController.php
+++ b/src/Controller/MemberController.php
@@ -176,29 +176,35 @@ public function handleRedirect(Request $request, string $customerId): Response
                 return $this->json(['success' => true]);
             }
 
-            $templatePrefix = '';
+            if (!$membershipApplication->getHasSentInitialEmail()) {
+                $templatePrefix = '';
 
-            if (is_dir($this->getParameter('kernel.project_dir') . '/templates/custom')) {
-                $templatePrefix = 'custom/';
-            }
+                if (is_dir($this->getParameter('kernel.project_dir') . '/templates/custom')) {
+                    $templatePrefix = 'custom/';
+                }
 
-            $memberEmail = $membershipApplication->getEmail();
-            $memberFullName = $membershipApplication->getFullName();
-            $memberFirstName = $membershipApplication->getFirstName();
-
-            $emailSender = $this->getParameter('app.noReplyAddress');
-            $organizationName = $this->getParameter('app.organizationEmail');
-            $message = (new Email())
-                ->subject("Bedankt voor je aanmelding bij $organizationName!")
-                ->to(new Address($memberEmail, $memberFullName))
-                ->from(new Address($emailSender, $organizationName))
-                ->html(
-                    $this->renderView($templatePrefix . 'email/html/apply.html.twig', ['memberFirstName' => $memberFirstName])
-                )
-                ->text(
-                    $this->renderView($templatePrefix . 'email/text/apply.txt.twig', ['memberFirstName' => $memberFirstName])
-                );
-            $this->mailer->send($message);
+                $memberEmail = $membershipApplication->getEmail();
+                $memberFullName = $membershipApplication->getFullName();
+                $memberFirstName = $membershipApplication->getFirstName();
+
+                $emailSender = $this->getParameter('app.noReplyAddress');
+                $organizationName = $this->getParameter('app.organizationEmail');
+                $message = (new Email())
+                    ->subject("Bedankt voor je aanmelding bij $organizationName!")
+                    ->to(new Address($memberEmail, $memberFullName))
+                    ->from(new Address($emailSender, $organizationName))
+                    ->html(
+                        $this->renderView($templatePrefix . 'email/html/apply.html.twig', ['memberFirstName' => $memberFirstName])
+                    )
+                    ->text(
+                        $this->renderView($templatePrefix . 'email/text/apply.txt.twig', ['memberFirstName' => $memberFirstName])
+                    );
+                $this->mailer->send($message);
+                $membershipApplication->setHasSentInitialEmail(true);
+                $em = $this->getDoctrine()->getManager();
+                $em->persist($membershipApplication);
+                $em->flush();
+            }
 
             return $this->render('user/member/finished.html.twig');
         }
diff --git a/src/Entity/MembershipApplication.php b/src/Entity/MembershipApplication.php
index 35e9b13..d75a38a 100644
--- a/src/Entity/MembershipApplication.php
+++ b/src/Entity/MembershipApplication.php
@@ -112,6 +112,11 @@ class MembershipApplication {
      */
     private ?bool $paid = false;
 
+    /**
+     * @ORM\Column(type="boolean", options={"default": false})
+     */
+    private bool $hasSentInitialEmail = false;
+
     public function __construct() {
         $this->registrationTime = new DateTime();
     }
@@ -210,4 +215,7 @@ public function setContributionPeriod(int $contributionPeriod): void {
         $this->contributionPeriod = $contributionPeriod;
     }
 
+    public function getHasSentInitialEmail(): bool { return $this->hasSentInitialEmail; }
+    public function setHasSentInitialEmail(bool $hasSentInitialEmail): void { $this->hasSentInitialEmail = $hasSentInitialEmail; }
+
 }