Custom SMTP Settings (#561)

* Custom SMTP Settings

* Fix lint

* Custom SMTP add in Pricing plan

* Allow reset email settings

* improve custom SMTP using seprate abstract class

* test case for custom SMTP

* fix test case

* UI improvement

* add CASHIER_KEY in phpunit for testcase

* Attempt to fix tests

* Run pint and attempt to fix cache tests

* Fix user management tests

* Fix code linters

* Merged main & fix linting

---------

Co-authored-by: Julien Nahum <julien@nahum.net>

client/components/open/integrations/EmailIntegration.vue

@@ -4,6 +4,16 @@
     :integration="props.integration"
     :form="form"
   >
+    <p class="text-gray-500 text-sm mb-3">
+      You can <NuxtLink
+        class="underline"
+        :to="{ name: 'settings-workspace' }"
+        target="_blank"
+      >
+        use our custom SMTP feature
+      </NuxtLink> to send emails from your own domain.
+    </p>
+
     <text-area-input
       :form="integrationData"
       name="settings.notification_emails"

client/components/open/integrations/SubmissionConfirmationIntegration.vue

@@ -4,7 +4,19 @@
     :integration="props.integration"
     :form="form"
   >
-    <div>{{ emailSubmissionConfirmationHelp }}</div>
+    <div class="text-gray-500 text-sm">
+      {{ emailSubmissionConfirmationHelp }}
+    </div>
+
+    <p class="text-gray-500 text-sm mb-3">
+      You can <NuxtLink
+        class="underline"
+        :to="{ name: 'settings-workspace' }"
+        target="_blank"
+      >
+        use our custom SMTP feature
+      </NuxtLink> to send emails from your own domain.
+    </p>
 
     <div v-if="emailSubmissionConfirmationField">
       <text-input