Если на почтовой базе стоит Permanently delete documents after 48 hours, то после удаления документов их возможно восстановить?

 

Если применено мягкое удаление (в почте- в Корзину), то да. Тема хелпа: Adding a view for soft deletions

Displaying and restoring soft-deleted documents
Documents in the 'soft delete' state do not display in typical views and folders. Instead, you must create a shared view to contain and display documents in the soft deletion state. In this view, you can provide the user with an action programmed to un-delete documents and restore them to the database. In the Notes client, you can program the action with the formula @UndeleteDocument. In the Notes client, the "Remove from Trash" action in the Trash folder restores deleted mail messages.
A user can permanently delete documents from the Trash folder by selecting one or more documents and choosing Edit - Delete or by pressing the DEL key. You could also provide an action that uses the @HardDeleteDocument command to permanently remove documents from the Trash folder. For an example of this, see the "Empty Trash" action in the Trash folder.

 

Недавно в форуме разработки, кажется, подымался вопрос об организации удаления документов в корзину, была приведена ссылка на хорошую статью. Рекомендую для общего развития.

 

Если на почтовой базе стоит Permanently delete documents after 48 hours, то после удаления документов их возможно восстановить?

Эта опция отвечает за очищение корзины