diff --git a/site/plugins/send-button/routes/send-newsletter.php b/site/plugins/send-button/routes/send-newsletter.php
index 0f56d92..7e34840 100644
--- a/site/plugins/send-button/routes/send-newsletter.php
+++ b/site/plugins/send-button/routes/send-newsletter.php
@@ -1,5 +1,7 @@
 <?php
 
+set_time_limit(600);
+
 return [
     'pattern' => '/send-newsletter.json',
     'method'  => 'POST',
@@ -26,7 +28,7 @@ return [
 
         $recipients = $data->isTest
             ? $kirby->users()->pluck('email', null, true)
-            : page('lettre')->subscribers()->toStructure()->pluck('email', true, true);
+            : page('lettre')->subscribers()->toStructure()->pluck('email', ',', true);
 
         if (empty($recipients)) {
             return json_encode([
@@ -47,26 +49,33 @@ return [
         $sentEmails = [];
         $errors = [];
 
-        foreach ($recipients as $recipient) {
-            try {
-                $kirby->email([
-                    'from'     => $from,
-                    'to'       => $recipient,
-                    'subject'  => $subject,
-                    'template' => 'newsletter',
-                    'data'     => [
-                        'body'      => $emailPage->body(),
-                        'url'       => (string) $emailPage->url(),
-                        'recipient' => $recipient,
-                    ],
-                ]);
-                $sentEmails[] = $recipient;
-            } catch (Exception $error) {
-                $errors[] = [
-                    'email'   => $recipient,
-                    'message' => $error->getMessage(),
-                ];
+        $batchSize = 5;
+        $pauseBetweenBatches = 1;
+
+        foreach (array_chunk($recipients, $batchSize) as $batch) {
+            foreach ($batch as $recipient) {
+                try {
+                    $kirby->email([
+                        'from'     => $from,
+                        'to'       => $recipient,
+                        'subject'  => $subject,
+                        'template' => 'newsletter',
+                        'data'     => [
+                            'body'      => $emailPage->body(),
+                            'url'       => (string) $emailPage->url(),
+                            'recipient' => $recipient,
+                        ],
+                    ]);
+                    $sentEmails[] = $recipient;
+                } catch (Exception $error) {
+                    $errors[] = [
+                        'email'   => $recipient,
+                        'message' => $error->getMessage(),
+                    ];
+                }
             }
+
+            sleep($pauseBetweenBatches);
         }
 
         if (!$data->isTest) {