nimbus-eth2/docs/the_nimbus_book/src/email-notifications.md

Email notifications

You can create an account on beaconcha.in to set up email notifications in case your validator loses balance (goes offline), or gets slashed.

Tip: If your validator loses balance for two epochs in a row, you may want to investigate. It's a strong signal that it may be offline.

1. Sign up at beaconcha.in/register

2. Type your validator's public key into the searchbar

3. Click on the bookmark icon

4. Tick the boxes and select Add To Watchlist