The true value of your email account to crooks is not merely in its ability to pump spam or even forward malicious software and viruses to your entire contact list. Hacked email accounts are not only used to blast junk messages, they are harvested for the email addresses of your contacts. An attacker in control of your account can simply visit the websites that manage those accounts, request a password reset, click a link in an email, and change your passwords. Even if your email isn’t tied to online merchants, it is probably connected to other accounts you care about.”]
Source: https://gizmodo.com/how-much-your-inbox-is-worth-to-cybercriminals-1672678042