This is huge asset of Xrp in a ledger wallet which many users use this kind of wallet. This is very important not to click any links connected to your email as this may be the reasons of scam attacked. When it comes to emails I have different account of email to avoid this kind of scenario. I can't imagine losing million of coins that you save in a wallet so we must be cautious.
I hope you don't mind but this is not about the Ledger Wallet itself, as I understand with the situation it was the fault of the owner might accidentally send his XRP to the others with the use of a phishing site. Even if we use separate email accounts but can't sometimes be neglected scammers/hackers will tend to track you, the time that they see a leak on your account that's the time that they will put you in compromise.
To have this kind of incident, everyone could be cautious, not because you have a strong password, 2FA, or anything that involves security but the most important is to double-check the sites that we are using, mostly many have been tricked to this.