Navigate to your Email Notification Settings. You can find this page by clicking your name in the website header, and then clicking "Settings" in the dropdown. Email Notification Settings are at the bottom of the Account & Notifications settings page.
Nomad breaks out email settings into 4 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.