A new phishing campaign is underway that pretends to be a list undelivered email being held for you on your Outlook Web Mail service. Users are then prompted to decide what they wish to do with each mail, with the respective links leading to a fake login form.Thankfully, unlike recent phishing landing pages hosted on Excel Online or Microsoft Azure, this phishing scam utilizes a landing page hosted on a hacked site. This make it easier to detect as suspicious as the URL will not be the correct one for your email server.
Source: https://www.bleepingcomputer.com/news/security/new-phishing-scam-asks-you-to-manage-your-undelivered-email/