Enable email notifications
Open your personal notification settings
Click your workspace name in the upper-left corner and select Settings.
In the sidebar, under Account settings, click Notifications.
Turn on the Email method
Under Notification methods, toggle Email on. The App (in-app)
method is always on, and Slack appears here when it is enabled for your
workspace.
Choose which events send an email
For each event, use the checkboxes to control how you’re notified. Each
event has a column for the App (in-app) method and a column for the
Email method, so you can receive an event in-app, by email, or both.

