Umail, a free, disposable, and anonymous email service, allows third-party companies to collect non-personally identifiable information using cookies:

• Purpose: To provide advertisements about goods and services that may be of interest to you
• Information collected: Click stream information, browser type, time and date, and subject of advertisements clicked
• How it's collected: Through cookies or third-party web beacons 

Users can opt out of some third-party vendors' uses of cookies for personalized advertising by visiting YourAdChoices.com

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Umail's privacy policy also states that they:

• Only collect information lawfully in accordance with the General Data Protection Regulation (GDPR)
• Do not store your IP address
• Do not sell, trade, or otherwise transfer your personally identifiable information to outside parties