No. E-letters are not e-mails. These items, e.g., documents, contracts, or invoices, are sent electronically to Österreichische Post and are then delivered as e-letters to your e-letterbox.
In addition to being convenient and swift, e-letters come with another decisive benefit: security. Sending sensitive documents or recipient data via e-mail is not a secure process. For e-letters, this information is deposited on a secure portal, a so-called e-letterbox.