: This adds a second layer of security, such as a text code or authenticator app, making it much harder for hackers to use stolen credentials.

Sending fake emails that include your real (leaked) password to scare you into paying a ransom. Why "2020" and "Install" are Search Keywords

Why hotmail.com stopped delivering to aol.com and yahoo.com.

Services like Google Workspace or Microsoft 365 require you to add a "TXT record" to your domain settings to prove you own it.