Deprecate static functions in MailTemplate and inject app

migrations/61-62/new-deprecations.md

@@ -11,6 +11,40 @@ New Deprecations
 
 This page lists all the new deprecations you should be aware of and what you should now be using instead.
 
-:::tip[Reader Note]
-  No deprecations have been introduced in Joomla 6.2 yet
-:::
+### MailTemplate static functions deprecated
+
+PR: [47677](https://github.com/joomla/joomla-cms/pull/47717)
+Files: 
+- `libraries/src/Mail/MailTemplate.php`
+Description:
+The following static functions in the `MailTemplate` have been deprecated and will be removed without replacement in 8.0:
+- `getTemplate`
+- `createTemplate`
+- `updateTemplate`
+- `deleteTemplate`
+
+```php
+// Old code
+MailTemplate::getTemplate(...);
+
+// New code:
+Factory::getApplication()->bootComponent('com_mails')->getMVCFactory()->createModel('Template', 'Administrator')->getTemplate();
+
+// Old code
+MailTemplate::createTemplate(...);
+
+// New code:
+Factory::getApplication()->bootComponent('com_mails')->getMVCFactory()->createModel('Template', 'Administrator')->save();
+
+// Old code
+MailTemplate::updateTemplate(...);
+
+// New code:
+Factory::getApplication()->bootComponent('com_mails')->getMVCFactory()->createModel('Template', 'Administrator')->save();
+
+// Old code
+MailTemplate::deleteTemplate(...);
+
+// New code:
+Factory::getApplication()->bootComponent('com_mails')->getMVCFactory()->createModel('Template', 'Administrator')->delete();
+```