diff --git a/dashboard/src/components/MailboxDialog.vue b/dashboard/src/components/MailboxDialog.vue
index c718fe976..ed3405a67 100644
--- a/dashboard/src/components/MailboxDialog.vue
+++ b/dashboard/src/components/MailboxDialog.vue
@@ -107,7 +107,7 @@ defineExpose({
     active.value = m ? m.active : true;
     enablePop3.value = m ? m.enablePop3 : false;
     storageQuotaEnabled.value = m && m.storageQuota ? true : false;
-    storageQuota.value = m ? m.storageQuota : 5*1000*1000*1000;
+    storageQuota.value = m && m.storageQuota ? m.storageQuota : 5*1000*1000*1000;
     usersAndGroupsAndApps.value = [];
 
     if (props.users.length) usersAndGroupsAndApps.value.push({ separator: true, label: 'Users' });
diff --git a/dashboard/src/views/EmailMailboxesView.vue b/dashboard/src/views/EmailMailboxesView.vue
index 0b45c850e..0db35be08 100644
--- a/dashboard/src/views/EmailMailboxesView.vue
+++ b/dashboard/src/views/EmailMailboxesView.vue
@@ -205,7 +205,6 @@ async function refresh() {
 
 async function onMailboxDialogSuccess(mailbox) {
   await refreshDomain(mailbox.domain);
-  await refreshDomainUsage(mailbox.domain);
 }
 
 onMounted(async () => {
@@ -277,7 +276,7 @@ onMounted(async () => {
           <span v-else>{{ $t('main.loadingPlaceholder') }} ...</span>
         </template>
         <template #storageQuota="mailbox">
-          <span v-if="cachedMailboxUsage[mailbox.fullName] && typeof cachedMailboxUsage[mailbox.fullName].quotaLimit !== 'undefined'">{{ prettyDecimalSize(cachedMailboxUsage[mailbox.fullName].quotaLimit) }}</span>
+          <span v-if="mailbox.storageQuota > 0">{{ prettyDecimalSize(mailbox.storageQuota) }}</span>
           <span v-else>-</span>
         </template>
         <template #actions="mailbox">