The bell at the top right (Notifications) lists important events, for example new replies, emails ready for approval, overdue follow-ups, leads assigned to you, finished or failed discoveries, completed or paused campaigns, verified domains, low or used-up allowance, members joining the team and support replies. Mark all as read clears them.
When a new reply arrives, the lead's owner also gets an email; replies to leads without an owner show in the bell for all members.
Email preferences are under Settings › Account › Notifications: you can turn off Operations & Campaigns notifications; System & Billing notifications (technical issues, payment alerts, usage limits) are required.
To see notifications in the tool your team uses, connect Slack or Microsoft Teams on the Integrations page.