Windows 10: I got hacked all my contacts are getting emails what do I do?

I got hacked what do I do, people are getting my emails/

:)

 

Email contacts missing

1. If you open Mail app and click the + sign for New mail > type first couple of letters of a contact name > will a list of suggested names appear ?

2. Go to All apps > scroll to P > click People. Is the contact list there ?

 

Yahoo Email Contacts List

At work I have a rather large list of contacts, sometimes I have multiple email addresses within one single contact. For example, lets say I have a contact "Bob", within that contact I have L: emailaddress1@techpowerupisawesome.com and L: emailaddress2@techpowerupisawesome.com. When I begin a new email, if I type "Bob", both of these addresses will appear, but I can only select one. I'd like to select both without having to retype Bob to make the list appear again to click the other.

I'm aware you can click the "To:" button to make the list of contacts appear, but you need to scroll down and find your contact, then shift click to select them all. Scrolling around can be troublesome with the amount of contacts I have. I'm not really interested in making groups for various reasons.

So is what I'm trying to do possible or am I asking too much?

 

Email hacked?

I'm stumped trying to figure out why my mom (and a number of other people on my contact list) have received a spam email coming from me. It goes along the lines of: "Hello! <insert link to some Viagra page at some Canadian pharmacy website here>". I'm using Yahoo mail. I have a friend who says he's been getting spam emails from one of his friends, who also uses Yahoo mail. I'm wondering if something's going on with Yahoo mail, or is this just some coincidence, and if it is just a coincidence, then who hacked my email, and how did they even do it? I certainly never told anyone my password for anything, let alone my email address. I don't have a keylogger or any other virus either, I just ran a full malwarebytes scan and it came back clean.