Muting Conversations/Blocking People
This section will teach you how to block people who you don’t want messages from and how to mute active email threads.
Blocking Users
Open Message
Left Click the three dots on the top right of the message next to reply

In the newly opened window press Block “Sender’s name”

Muting Conversations
Hover mouse over desired message
Right Click the message
Left Click the Mute option

These people and conversation will be blocked and muted until you decide to turn them off by repeating the steps above.