Navigate to your Email Notification Settings. You can find this page by clicking the drop-down arrow in the top right corner, and then clicking "Settings" in the dropdown.
Nomad breaks out email settings into 5 categories, each of which is described. If you are receiving emails with recommended jobs that are not relevant to you, make sure your job preferences updated. If you want to stop receiving a certain type of email, simply uncheck the checkbox and click the Save button.