**It may be: the Agencia Tributaria sends a notice when a letter for your NIE is waiting in the DEHú**, the administration's online mailbox. The notice itself is only information: don't click its links. Type the address of the DEHú or of the Agencia Tributaria's online office (Sede electrónica) yourself, and open the notification there.

## Spotting a fake

- The Agencia Tributaria's notices come from **AgenciaTributaria@correo.aeat.es**. Even then, open nothing from the message.
- It never attaches files, never asks for bank or card details by e-mail or text, and never refunds to a card.
- Every letter carries a **CSV**, a 16-character code at the foot of the first page, that brings up the original on the Sede.

## The 10-day rule

- If you chose electronic notifications, one left unopened for **10 calendar days** counts as delivered, and the letter's deadline runs.
- If you didn't, the letter also comes by post: its deadline runs from delivery, or from the day you open it online if that comes first.

## Opening it

Sign in with Cl@ve, a digital certificate or eIDAS from another EU country. A representative with your power of attorney can read your notifications for you.

Once it's open, find what it asks in our free [tax letter decoder](https://casitatax.com/en/tax-letters/), or ask us in the chat.