ISTWCMS-5613 Add help text to send from in webform email handler

uw_cfg_common.module

@@ -413,6 +413,18 @@ function uw_cfg_common_form_webform_settings_form_alter(array &$form, FormStateI
   $form['ajax_settings']['#access'] = FALSE;
 }
 
+/**
+ * Implements hook_form_FORM_ID_alter().
+ *
+ * Configure admin/structure/webform/manage/WEBFORM_ID/handlers.
+ */
+function uw_cfg_common_form_webform_handler_form_alter(array &$form, FormStateInterface $form_state, string $form_id): void {
+  // Add help text to 'SEND FROM (WEBSITE/DOMAIN)' in webform email handler.
+  if ($form['#webform_handler_plugin_id'] === 'email') {
+    $form['settings']['from']['#description'] = t('This must be an <strong>@uwaterloo.ca</strong> email address for sending to succeed. Please consider using the reply-to email option instead when emails are not limited to campus accounts.');
+  }
+}
+
 /**
  * Implements hook_form_FORM_ID_alter().
  *