So, anyone who gained access to your email address would be able to tell a lot about the websites you use (including your financial accounts). It may give them information they need to steal money or uncover other personal information that can then be sold on the web.

Can someone hack you if they have your email?

Send emails from your address This is probably the most obvious thing hackers can do with your email address, and its a nuisance for sure. Once hackers have your email address, they can use it to target more than just you, sending out email blasts to anyone (maybe even everyone!) in your contact list.