diff --git a/lib/ext/Syncroton/Command/Sync.php b/lib/ext/Syncroton/Command/Sync.php
--- a/lib/ext/Syncroton/Command/Sync.php
+++ b/lib/ext/Syncroton/Command/Sync.php
@@ -911,6 +911,8 @@
 
                         $applicationData = $change->appendChild($this->_outputDom->createElementNS('uri:AirSync', 'ApplicationData'));
 
+                        $collectionData->options['_changesOnly'] = true;
+
                         $dataController
                             ->getEntry($collectionData, $serverId)
                             ->appendXML($applicationData, $this->_device);
diff --git a/lib/kolab_sync_data_email.php b/lib/kolab_sync_data_email.php
--- a/lib/kolab_sync_data_email.php
+++ b/lib/kolab_sync_data_email.php
@@ -250,6 +250,14 @@
             }
         }
 
+        // Categories (Tags)
+        $result['categories'] = $headers->others['categories'] ?? [];
+
+        //The body never changes, so make sure we don't re-send it to the client on a change
+        if ($collection->options['_changesOnly'] ?? false) {
+            return new Syncroton_Model_Email($result);
+        }
+
         // get truncation and body type
         $airSyncBaseType = Syncroton_Command_Sync::BODY_TYPE_PLAIN_TEXT;
         $truncateAt = null;
@@ -499,9 +507,6 @@
             }
         }
 
-        // Categories (Tags)
-        $result['categories'] = $message->headers->others['categories'] ?? [];
-
         $is_ios = preg_match('/(iphone|ipad)/i', $this->device->devicetype);
 
         // attachments
diff --git a/tests/Sync/Sync/EmailTest.php b/tests/Sync/Sync/EmailTest.php
--- a/tests/Sync/Sync/EmailTest.php
+++ b/tests/Sync/Sync/EmailTest.php
@@ -153,6 +153,7 @@
         $root .= "/ns:Commands/ns:Add";
         $this->assertStringMatchesFormat("{$folderId}::%d", $xpath->query("{$root}/ns:ServerId")->item(0)->nodeValue);
         $this->assertSame('sync test with attachment', $xpath->query("{$root}/ns:ApplicationData/Email:Subject")->item(0)->nodeValue);
+        $this->assertSame(1, $xpath->query("{$root}/ns:ApplicationData/AirSyncBase:Body")->count());
 
         return $syncKey;
     }
@@ -245,7 +246,11 @@
         $this->assertSame($folderId, $xpath->query("{$root}/ns:CollectionId")->item(0)->nodeValue);
         $this->assertSame(0, $xpath->query("{$root}/ns:Commands/ns:Add")->count());
         $this->assertSame(2, $xpath->query("{$root}/ns:Commands/ns:Change")->count());
+        $this->assertSame(2, $xpath->query("{$root}/ns:Commands/ns:Change/ns:ApplicationData/Email:Read")->count());
+        $this->assertSame('0', $xpath->query("{$root}/ns:Commands/ns:Change/ns:ApplicationData/Email:Read")->item(0)->nodeValue);
+        $this->assertSame('0', $xpath->query("{$root}/ns:Commands/ns:Change/ns:ApplicationData/Email:Read")->item(1)->nodeValue);
 
+        $this->assertSame(0, $xpath->query("{$root}/ns:Commands/ns:Change/ns:ApplicationData/AirSyncBase:Body")->count());
         return $syncKey;
     }
 
diff --git a/tests/SyncTestCase.php b/tests/SyncTestCase.php
--- a/tests/SyncTestCase.php
+++ b/tests/SyncTestCase.php
@@ -379,6 +379,7 @@
         $xpath = new \DOMXpath($dom);
         $xpath->registerNamespace("ns", $dom->documentElement->namespaceURI);
         $xpath->registerNamespace("AirSync", "uri:AirSync");
+        $xpath->registerNamespace("AirSyncBase", "uri:AirSyncBase");
         $xpath->registerNamespace("Calendar", "uri:Calendar");
         $xpath->registerNamespace("Contacts", "uri:Contacts");
         $xpath->registerNamespace("Email", "uri:Email");