What Lies Behind The Undelivered Email Reports Email Scam

What Is the “Undelivered Email Reports” Scam?

A message arrives in your inbox claiming that several emails couldn't be delivered and have been quarantined. It appears urgent and official, warning that unless you act soon, the messages will be deleted. At first glance, it seems like a system alert from your email provider. But it's not. This is a cleverly disguised email scam designed to lead unsuspecting users to a fake login page.

The goal of the scam is to convince you to click a button—often labeled "RELEASE ALL" or something similar. This button doesn't restore any actual messages; instead, it redirects you to a fraudulent webpage that mimics a legitimate email sign-in screen.

Here's what the fraudulent message says:

Subject: Notification: Undelivered Email(s) in Inbox - Please Investigate and Resolve

Undelivered Email Reports

Hello XXXXXXX,
You have 4 emails in quarantine.

SUBJECT: Re:Re: Order No# GN/2425/04231...
TO: "info" (XXXXXXX)
FROM: Sales - Sara Mimbrero | 5/17/2025 1:08:48 a.m.PM | Pending
Release
Delete

SUBJECT: Fwd: Payment ---- Forwarded message ----
TO: "info" (XXXXXXX)
FROM: Accounts | 5/17/2025 1:08:48 a.m. | Pending
Release
Delete

To see remaining 2 undelivered emails held in quarantine, select "Release All" incoming mails from our old version to our new version below:
RELEASE ALL

Emails will be deleted automatically after 7 days. You can change the frequency of these notifications within your email quarantine portal.

How the Scam Is Structured

The message typically claims that four emails have been held in quarantine. It may list the subject lines of two of them, often referencing topics like payment issues or shipping delays to pique your interest. The others are vaguely referenced but not detailed—adding a layer of urgency and mystery.

The design of the email often mimics the style of real administrative notifications from popular email services. It may include official-looking formatting, familiar logos, or generic system-like language to appear legitimate and professional.

Where Clicking Takes You

Clicking on the provided button doesn't do what the message promises. Instead, it sends you to a phishing site. These pages are usually created to look like common email login portals. While the site may have been inactive during certain investigations, there's a high chance it will become functional again in future variations of the scam.

If you enter your credentials into this fake form, that information is instantly captured by the scammers. With those login details in hand, attackers can gain access to your email—and potentially, to any service linked to it.

What Scammers Do With Stolen Accounts

Once scammers control your email account, the consequences can stretch far beyond one inbox. Many people reuse passwords or have multiple platforms tied to a single email address. Social media accounts, online shopping sites, entertainment subscriptions, and even financial services could be at risk.

Cybercriminals often exploit stolen accounts in a variety of ways: requesting money from your contacts, spreading more scams, impersonating you online, or even conducting unauthorized financial transactions.

Why This Scam Is Effective

Unlike the stereotypical spam filled with spelling errors and broken formatting, this scam is polished. It may contain little to no grammatical mistakes and might look convincing enough to fool even the cautious reader. Scammers know that people trust well-structured emails and may not scrutinize them as much as poorly written ones.

The subject line varies but usually carries a tone of urgency. Phrases like "Undelivered Email(s) in Inbox" or "Action Required" are chosen to spark immediate concern, especially for professionals or anyone expecting important communications.

Other Similar Phishing Campaigns

The "Undelivered Email Reports" scam isn't unique. It's part of a broader trend of phishing campaigns that mimic system alerts. Past examples include "Your Document Has Been Held In A Queue" and "Mailbox Storage Notification." These scams all follow a similar strategy: trick the user into taking action on a fake issue.

Whether the lure is an unread message, a storage warning, or a missing document, the goal is the same—harvest your login credentials or other sensitive information.

Beyond Phishing: Other Threat Delivery Methods

Phishing emails are often just one method of delivering threats. Many spam messages carry attachments or links to files that, once opened, install unwanted programs. These files could be disguised as PDFs, Word documents, or compressed folders. Some require user interaction, such as enabling macros, to activate the threat.

This highlights the importance of being careful with suspicious links and unfamiliar attachments. Even a single click can lead to unintended consequences.

How to Protect Yourself

There's no need to panic, but awareness is essential. If you receive an unexpected email telling you to release messages or verify login information, don't rush. Double-check the sender's address, and avoid clicking any links or buttons until you verify the message's authenticity.

If you've already interacted with a phishing site and entered your information, change your passwords immediately—especially for your email and any connected accounts. Contact the official support teams of any services you think might be compromised.

Bottom Line

To stay safe from email-based threats, be cautious with all unsolicited messages, no matter how professional they appear. Avoid downloading files or clicking links from unfamiliar sources. Download software only from reputable vendors and avoid using unofficial updates or activation tools.

Staying informed, alert, and cautious is the best line of defense in a digital world where appearance can be deceiving.