How to spot emails like "Incoming Failed Messages" scam email

What kind of email is "Incoming Failed Messages"?

After investigating this email, we found that it is a fake letter from an email service provider. It is created by scammers who aim to trick recipients into providing sensitive information on a phishing website. This email must be ignored.

More about the "Incoming Failed Messages" scam email

Scammers behind this email attempt to trick recipients into believing that 9 messages cannot be delivered due to a validation error. Their letter contains a fake list of blocked messages (quarantined mail). The purpose of this phishing email is to lure recipients into clicking the "RELEASE ALL (9)" button and entering the requested details on the opened page.

The website that gets opened after clicking the "RELEASE ALL (9)" button asks to enter email account login credentials (email address and password) to log into the email account. The design of that page depends on the recipient's email address. For instance, if the recipient uses Yahoo Mail as the email service provider, the opened phishing page mimics the Yahoo page.

Scammers use this phishing website to steal email account login credentials. Typically, stolen email accounts are checked for sensitive information and (or) sold to third parties, used to send spam, or deliver malware. Also, scammers try to use stolen login credentials to access other accounts.

Similar scam emails in general

Phishing emails are used to extract sensitive information. Scammers attempt to obtain credit card details, social security numbers, login credentials, and other details that could be used to steal identities, money, online accounts, etc.

Usually, phishing letters are disguised as official/important/urgent letters from banks, email service providers, various companies, and other entities. Examples of phishing emails are "Email Security Update Scam", "Your Wages Monthly Activity Statement Email Scam", and "Authenticate Account Email Scam".

It is important to know that cybercriminals can also use email to deliver malware.

How do spam campaigns infect computers?

Cybercriminals who use email to deliver malware include malicious links or attachments in their emails. Their goal is to trick recipients into opening those links or files. Typically, threat actors attempt to trick recipients into opening pages or files like MS Office, PDF documents, executables, ISO files, archives, or JavaScript files used to distribute malware.

How to avoid installation of malware?

Be careful about opening links or files in emails that are not irrelevant and sent from unknown addresses. Always investigate emails before opening their contents. Download programs (and files) from official websites (or stores). Do not trust other sources such as P2P networks, unofficial pages, third-party downloaders, etc.

Keep the operating system and installed programs updated. Activate and update them using tools/features provided by their official developers.

If you've already opened malicious attachments, we recommend running a scan with Combo Cleaner Antivirus for Windows to automatically eliminate infiltrated malware.

Text presented in the "Incoming Failed Messages" scam email:

Subject: E-Mail Notification: 9 Failed Incoming Messages on ******** server

9 Incoming Failed Messages

The following messages have been blocked by your administrator due to validation error.

You have 9 new messages in your email  quarantine.
Date:   11/7/2022 8:56:33 from (11/7/2022 8:56.
User:  ********
 
Click on Release All, to move these message(s) to your inbox folder:
 
                                                      Quarantined email
Status Recipient: Subject: Date:
Release ******** RE: Purchase Order #9910 07/11/2022
Release ******** FW: Proforma Invoice Urgently Needed 07/11/2022
Release ******** Re: SOA/ Payment Slip: 1002789 07/11/2022
Release ******** FW: SALES ORDER SO: 8920473 07/11/2022
 
 
RELEASE ALL (9)
 
 
Note: This message was sent by the system for notification  only. Please do not reply

If this message lands in your spam folder, please move it to your inbox folder for proper integration.

(c) Poweredby:  ******** Support. 2022

Screenshot of the fake Microsoft Bing page with an incorrect URL:

Other examples of emails from "Incoming Failed Messages" spam campaign:

Sample 1:

Text presented within:

Subject: FOUR (4) PENDING INCOMING EMAILS TO ************

 

********

FAILED INCOMING MESSAGES

The following messages has been blocked by your administrator due to 2024 NEW UPDATE validation error.

Hello ********

You have 4 new messages in your email quarantine.
USERNAME: ********

Click on READ MESSAGES BELOW, to read and move these message(s) to your inbox folder:

UNSUCCESSFUL RECEIVED EMAIL

Status Recipient: Subject: Date:
Pending ******** ******** Request proforma Invoice For payment 3/12/24 12:08:29
Pending ******** RFQ: Purchase Order // FEB 2024 (QTY-100pcs) 3/12/24 12:08:29
Pending ******** FW: Original Shipping docs confirmation 3/12/24 12:08:29
Pending ******** FW: 2023/03/12 BANK SWIFT COPY// Confirmation 3/12/24 12:08:29

READ MESSAGES (4)

Sample 2:

Text presented within:

Subject: Action required: ******** email account is full.

 

Incoming failed messages

FINAL NOTICE BEFORE PENDING MESSAGE DELETION
The following messages has been blocked by your mail administrator due to validation error.
You have 14 new messages in your email quarantine.
Attn User ID: ********
Click on Resolve Messages (14), to move these message(s) to your inbox folder:
                                                      Quarantined email
Status     Recipient:     Subject:     Date:
Pending     ********     Re: RFQ Supply/Installation Full Spec...     Tue Oct 29, 2024 12:14 p.m.
Pending     ********     Re: SAO/Outstanding Dues Oct,2024     Fri, Oct 18, 2024 11:01 a.m.
Pending     ********     Re: Revised PI #2252     Mon, Oct 28, 2024 9:44 a.m.
Pending      ********     Re: New invoice advance payment.     Tue, Nov 5, 2024 3:19 p.m.
RESOLVE MESSAGES (14)
Note: This message was auto sent by the system for notification only. Please do not reply

If this message lands in your spam folder, please move it to your inbox folder for proper integration.

This Email was sent to  ********
Unsubscribe from receiving this notice

Sample 3:

Text presented within:

Subject: Resolve Incoming Message

Incoming Failed Messages

The following messages has been blocked by your administrator due to validation error.

You have 3 new messages in your email quarantine.

User: ********

Click on Resolve Messages (3), to move these message(s) to your inbox folder: →
Quarantined email
Status Recipient: Subject: Date:
Pending ******** Proposal Agreement and Contract Purchase 10/14/2025
Pending ******** Re: Checking List 10/14/2025
Pending ******** Re: August Invoice 10/14/2025
RESOLVE MESSAGES (3)

Sample 4:

Text presented within:

Subject: Incoming Failed Messages Fix Here

Incoming Failed Messages
Email Quarantine Alert

Your email security system has identified messages that require your review.
Account: ********
Messages Detected: You have 15 new messages in your email quarantine.
Classification: Validation / Policy Block

For your protection, messages are held until verified by you. Please click "Resolve Messages (15)" to review,release, or delete the quarantined messages.
Status Subject Date
Pending Re: Payment... 17 March, 2026 04:12:18 AM
Pending Arrival Notice(BL#: PENF24188700) Ves.. 17 March, 2026 04:12:18 AM
Pending Re: Contract Signed//New Order 17 March, 2026 04:12:18 AM
Resolve Messages (15)

Screenshot of the promoted phishing site:

Sample 5:

Text presented within:

Subject: Incoming Failed Messages Fix Here

Incoming Failed Messages

Dear User,

The email security system has detected and temporarily blocked several incoming messages due to validation policy restrictions enforced by your organization's administrator.

A total of 15 incoming emails have been placed in your Quarantine Mailbox pending view.

Account Details
User: ********
Date: 17 March, 2026
Time: 04:48:35 AM

To restore delivery and move the affected messages to your primary inbox, please review and resolve the quarantined items through the secure message resolution interface.

Quarantined Messages Summary

Quarantined email
Status Recipient: Subject: Date:
Pending ******** Request For Quotaion 17 March, 2026 04:48:35 AM
Pending ******** RE: Purchase Order 17 March, 2026 04:48:35 AM
Pending ******** Re: Invoice 17 March, 2026 04:48:35 AM
Pending ******** Re: Payment Status - Paid 17 March, 2026 04:48:35 AM
Action Required

Please click "Resolve Messages (15)" to review,release, or delete the quarantined messages

Resolve Messages (15)

If no action is taken within the system retention period, the quarantined messages may be automatically removed in accordance with your organization's email security policy.

For assistance, please contact your IT Security Administrator or your organization's Email Support Team.

Email Security Gateway
Message Protection & Threat Prevention System
© System Notification - Automated Message

Instant automatic malware removal:

Manual threat removal might be a lengthy and complicated process that requires advanced IT skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:

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Types of malicious emails:

If you opened an attachment or downloaded a file from a suspicious email, run a full system scan with Combo Cleaner. If you only received the email and didn't engage with it, you don't need to scan anything - just identify the scam and delete it. The full procedure below covers both situations and what to do if you already clicked, replied, or sent money.

Credential theft Phishing emails

Fake login pages disguised as PayPal, Microsoft, Apple, banks, or social networks. The email pushes a link to a near-perfect copy of the real login screen. The moment you type your username and password, the attacker has them.

Common subject lines

• "Action required: confirm your account"
• "Your password expires today"
• "Unusual sign-in attempt detected"
• "Verify your billing information"

Malware delivery Emails with malicious attachments

Trojans hidden inside fake invoices, faxes, shipping confirmations, or Office documents. Opening the attachment runs the payload and infects the system - often with an info-stealer or remote-access trojan.

Common subject lines

• "Invoice INV-2026-XXXX attached"
• "Fax received - 3 pages"
• "Your shipping document is ready"
• "Voicemail from +1-XXX-XXX-XXXX"

Extortion Sextortion emails

Fake claims of webcam recordings demanding cryptocurrency. Almost always a bluff: the attacker pulls a real password from an old data breach to make the threat look credible, then claims to have video of you. They have no recording and no access.

Common subject lines

• "I know your password is XXXX"
• "Your account has been hacked"
• "I have recorded you - 48 hours to pay"
• "You have been compromised"

Callback fraud Refund & callback scams

"Your subscription was renewed for $499 - call to cancel." Norton, McAfee, Geek Squad, PayPal, and Wells Fargo variants are all common. There's no real subscription. The phone number in the email connects directly to the scammer, who walks you through "refunding" yourself - which is actually them stealing money from your bank.

Common subject lines

• "Norton subscription auto-renewed - $499.99"
• "McAfee Total Protection invoice"
• "Geek Squad order confirmation"
• "Your PayPal payment is being processed"

Credential theft Account suspension & verification scams

"Your account will be deleted in 24 hours - verify now." The artificial deadline is the whole point: it pressures you to click before checking details. The "verify" link goes to a phishing page styled to look like the real provider.

Common subject lines

• "Your account will be deleted in 24 hours"
• "Suspicious activity detected - verify now"
• "Final warning: account closure"
• "Action required to keep your account active"

Mixed payload Delivery & package scams

Fake DHL, USPS, UPS, or FedEx tracking, customs fees, or "package undeliverable" notices. Targets anyone expecting a parcel - the timing alone catches many people. The link hides either phishing (asking for card details to "release" the package) or a malware download.

Common subject lines

• "Your DHL package is held at customs"
• "USPS - delivery attempt failed"
• "FedEx tracking update - action required"
• "Pay $2.99 redelivery fee to release your parcel"

Remote access Tech support scams

Fake Microsoft, Apple, or "Windows Defender" security alerts pushing a phone number. Real Microsoft and Apple never email a phone number to call. The number connects you to a scammer who asks for remote access to "fix" the imaginary problem and then demands payment.

Common subject lines

• "Microsoft Defender expired - renew now"
• "Apple ID security alert"
• "Critical: virus detected on your PC"
• "Windows license expired - call now"

Wire fraud Advance-fee scams

Inheritance, lottery wins, romance, or business deals that ask for a small fee to release a much larger sum. The classic "Nigerian prince" 419 family of frauds. Once you pay the first fee, more fees appear (taxes, lawyer, transfer charges) until you stop paying. The promised money never exists.

Common subject lines

• "Inheritance from a relative you didn't know about"
• "You won the international lottery"
• "URGENT - business proposal worth $XX million"
• "Compensation fund release for fraud victims"

Wire fraud Business email compromise (BEC)

CEO impersonation asking employees to wire money or buy gift cards, or fake supplier invoices with newly "updated" bank details for payment redirection. The email often spoofs a real internal executive's display name and uses an external lookalike domain.

Common subject lines

• "Quick task - need you to buy gift cards"
• "Updated banking details for invoice payment"
• "Wire transfer request - urgent"
• "Are you available?" (CEO impersonation opener)

How to spot a malicious email?

Phase 1~ 2 min

Spot - identify the red flags

---

1

Check the sender's actual address, not the display name

30 sec

The display name (the human-readable part) is trivial to fake. Always check the full address that comes after it. Common red flags:

• Domain mismatch - service@paypa1.com, support@micros0ft-help.com, look-alike domains using digits or extra hyphens
• Free-email impersonation - any "official" message from a bank, courier, or platform sent from a @gmail.com, @outlook.com, or @yahoo.com address
• Reply-To mismatch - the From address looks legitimate but Reply-To points somewhere completely different

Why this matters

Real companies own their domains and send mail from them. A "DHL" message from a Gmail address is never legitimate, regardless of how convincing the body looks.

2

Watch for urgency, threats, and generic greetings

30 sec

Scams almost always rush you. The point is to make you act before you think. Treat any of the following as a strong signal:

• "Your account will be deleted in 24 hours"
• "Final notice" / "Immediate action required"
• "Dear Customer" or "Dear User" instead of your real name
• Threats of fines, account closure, legal action, or arrest
• Promises of refunds, prizes, or money you didn't earn
• Spelling and grammar mistakes in messages claiming to come from a major brand

3

Hover over every link before clicking

30 sec

On a desktop, hover the mouse over the link without clicking. The real destination shows in the bottom-left status bar of your browser or email client. On a phone, long-press the link to preview the URL.

• Real Microsoft, PayPal, or bank links go to those exact domains, not redirects through unrelated sites
• Shortened URLs (bit.ly, tinyurl, t.co) hide the real destination - never click them in unsolicited mail
• The visible link text and the actual URL must match - mismatches are the single biggest phishing red flag

Pro tip

When in doubt, don't click the link. Open a new browser tab and type the company's address yourself, then log in normally. If there really is an issue with your account, you'll see it there.

4

Treat unexpected attachments as hostile

30 sec

If you didn't ask for the file, don't open it - even if it appears to come from someone you know. Categories that should never be opened from email without verification through another channel:

• .exe, .scr, .iso, .img, .vbs, .bat - executables, never legitimate attachments
• .docx, .xlsx, .pptx with "Enable macros" prompts - the macros run the malware
• .pdf with "Click here to view" buttons - usually a phishing redirect, not a real document
• .zip, .rar, .7z archives, especially password-protected ones - the password defeats the email scanner

Phase 2~ 2 min

Report and delete - if you haven't engaged

---

If you only received the email and didn't reply, click, or open anything, the steps below are all you need. Your computer is not infected.

5

Don't reply, don't click "unsubscribe"

30 sec

Replying confirms your address is real and monitored, which gets you added to higher-value scam lists. The "unsubscribe" link in a scam message is rarely a real opt-out - it usually leads to a phishing page or downloads a tracking pixel.

Instead, mark the message as junk or phishing inside your email client (this trains the spam filter), then block the sender.

6

Report the scam to your email provider and authorities

1 min

Inside your email client:

• Gmail: open the message → ⋮ menu → Report phishing
• Outlook / Outlook.com: ⋯ menu → Report → Report phishing
• Apple Mail / iCloud: Move to Junk, then forward to reportphishing@apple.com

Forward or report to authorities:

• International: forward to reportphishing@apwg.org
• United States: ic3.gov (FBI)
• United Kingdom: forward phishing emails to report@phishing.gov.uk (NCSC SERS); for financial loss report at reportfraud.police.uk (Report Fraud, the successor to Action Fraud; 0300 123 2040)
• Canada: antifraudcentre.ca
• Australia: scamwatch.gov.au
• EU: your national CERT - find yours via the ENISA CSIRT map

After reporting, delete the email and empty the Trash folder so you don't accidentally open it later.

Phase 3~ 10–60 min

Recover - if you already engaged with the scam

---

Pick the step below that matches what you did. If multiple apply, work through them in the order they appear - the steps are arranged from lowest to highest risk.

7

You only clicked a link (didn't enter anything or download anything)

Scenario: clicked link only10 min

Close the page right away. Don't enter any information, even if the page looks legitimate.

• Clear your browser cache and cookies for the last hour - Chrome/Edge: Ctrl+Shift+Del → Last hour → check Cookies and Cached files
• Run a quick scan with Combo Cleaner in case the page tried to drop a file silently (drive-by download)
• Update your browser to the latest version - most drive-by exploits target outdated browsers
• Watch for new browser pop-ups, redirects, or unfamiliar notifications over the next few days

Why this matters

Modern browsers block most drive-by attacks, but a single click on a phishing page can still be enough on an outdated browser or unpatched plugin. A quick scan catches anything that landed silently.

8

You opened an attachment or downloaded a file - run a full malware scan

Scenario: opened attachment⚠ Highest risk60–90 min

Opening an attachment is the most common path to actual infection. Treat the system as compromised until the scans below come back clean. Work through these sub-steps in order:

8.1Disconnect from the network

Unplug Ethernet and turn off Wi-Fi. If the attachment was an info-stealer or remote-access trojan, this stops it from sending data out or receiving commands. Keep the network off until you've booted into Safe Mode (next step) - you'll reconnect there briefly to download the scanners.

8.2Boot into Safe Mode with Networking, then download the scanners

Windows 11: Settings → System → Recovery → Advanced startup → Restart now → Troubleshoot → Advanced options → Startup Settings → Restart → press 5 or F5.

Windows 10: hold Shift, click Power → Restart → Troubleshoot → Advanced options → Startup Settings → Restart → press F5.

Once Safe Mode has loaded, turn Wi-Fi back on and download Combo Cleaner (used in 8.4) and Microsoft Safety Scanner (used in 8.5). Safe Mode loads only minimal drivers, so most malware can't auto-run while you're getting the tools. Save both installers to your Desktop.

8.3Run Microsoft Defender Offline

Reboot to normal Windows. Open Windows Security → Virus & threat protection → Scan options. Select Microsoft Defender Antivirus (offline scan) and click Scan now. The PC restarts into a stripped-down environment and scans the disk before Windows fully loads - this is what catches rootkits and bootkits.

Recommended antivirus

Combo Cleaner

VB100 certified. Includes anti-trojan, registry/persistence scanning, and anti-spyware in one pass. The 7-day free trial is available.

Download Combo Cleaner

8.4Run a full Combo Cleaner scan

Install Combo Cleaner and run a full system scan (not the quick scan). Let it complete fully, review what it found, and apply the recommended actions. Combo Cleaner will quarantine known trojans and remove their persistence in the registry.

8.5Run Microsoft Safety Scanner as a second-opinion scan

Download Microsoft Safety Scanner (MSERT.exe). The binary expires every 10 days, which means every download has the latest signatures. Run a full scan after Combo Cleaner to catch anything one engine alone might miss.

8.6Reset browsers and clear notification permissions

Many email-borne trojans drop adware that hijacks browsers. Reset each browser you use:

Chrome: chrome://settings/reset → Restore settings to their original defaults. Then chrome://settings/content/notifications - remove unfamiliar sites.

Edge: edge://settings/reset. Then edge://settings/content/notifications.

Firefox: about:support → Refresh Firefox.

8.7Re-enable Defender, Tamper Protection, and update everything

Open Windows Security → Virus & threat protection → Manage settings and confirm Real-time protection, Cloud-delivered protection, and Tamper Protection are all on. Then run Settings → Windows Update → Check for updates and update browsers and applications.

Important

If the scans keep finding new threats on each run, or files reappear after deletion, you may have a deeper compromise that needs a clean Windows reinstall. See pcrisk's full manual malware removal guide for the extended procedure (Process Explorer, Autoruns, hosts file inspection).

9

You entered credentials on a fake login page

Scenario: shared password⚠ Act fast20 min

Assume the attacker has your password and is using it right now. Speed matters.

1. Change the password from a different, known-clean device (your phone is fine if it's not infected). Don't reuse the old password anywhere else.
2. Enable two-factor authentication if you haven't already. Prefer an authenticator app or hardware key over SMS.
3. Sign out of all sessions - most platforms have a "sign out everywhere" option in security settings, which kicks the attacker out.
4. Review recent activity - look for unfamiliar logins, new devices, forwarding rules, or app permissions. Remove anything you don't recognize.
5. Check your other accounts - if you reused that password anywhere else, change it there too. Check your exposure at haveibeenpwned.com.
6. Update security questions - the attacker may have seen the answers in your account profile.

Why email comes first

If you only have time to change one password, change your primary email password - it's the recovery hub for every other account. An attacker who controls your email can reset everything else.

10

You sent money or shared bank, card, or ID details

Scenario: financial loss⚠ Contact bank now30 min

Time is the single biggest factor in recovering money. Banks can sometimes recall a wire or reverse a card transaction within the first few hours.

1. Call your bank or card issuer immediately. Use the number on the back of the card, not any number from the scam email. Ask them to freeze the card, reverse the transaction if possible, and flag the account for fraud monitoring.
2. If you sent a wire transfer or used a money-transfer service (Western Union, MoneyGram, Zelle, Wise), call them directly and request a recall. Some can be reversed within minutes if reported fast.
3. If you sent cryptocurrency or gift cards, recovery is unlikely - but report it anyway, since law enforcement tracks these patterns.
4. File a police report. You'll need the report number for any insurance, bank, or credit-bureau claim. Save the report number.
5. File with the right authority for your country:
   • US: ic3.gov + reportfraud.ftc.gov
   • UK: reportfraud.police.uk (Report Fraud, the successor to Action Fraud; 0300 123 2040)
   • Canada: antifraudcentre.ca
   • Australia: scamwatch.gov.au
   • EU: your national CERT or police cybercrime unit
6. Set fraud alerts on all major credit bureaus if you shared any ID details. US: Equifax, Experian, TransUnion. UK: Experian, Equifax, TransUnion (Cifas Protective Registration is a stronger option).
7. Save all evidence - the original email (with full headers), screenshots of the fake site, transaction records, any phone numbers or chat logs.

Phase 4~ 15 min + 30 days

Verify & monitor

---

11

Final scan and startup-app check

15 min

Reconnect to the network and run one final full scan with Combo Cleaner, followed by a Windows Defender quick scan. Then open Task Manager (Ctrl + Shift + Esc) and switch to Startup apps - disable anything unfamiliar.

Make sure Windows, browsers, and any applications you use are fully up to date. The infection vector that worked on you once usually involves outdated software.

12

Monitor accounts and credit for 30 days

5 min/day · 30 days

Most fraud follow-ups land in the first month. Until that window closes, keep watching:

• Bank and card statements - daily for the first week, then weekly
• Email - watch for password-reset confirmations or login alerts you didn't trigger
• Credit report - US: free at annualcreditreport.com; UK: Experian, Equifax, TransUnion all have free tiers
• Breach alerts - sign up at haveibeenpwned.com to be notified when your email appears in new leaks

If anything new appears in any of those, treat it as a continuing compromise: change passwords again, contact the bank again, and update the police report.

Important: If you didn't click anything, didn't reply, and didn't open any attachment, your computer is not infected - just delete the email and move on. If you opened an attachment or downloaded a file, run an automated scan with Combo Cleaner and Windows Defender and stop there. That path catches the vast majority of email-borne malware without the risk of breaking Windows by deleting the wrong file.

Frequently Asked Questions (FAQ)

Why did I receive this email?

Most probably, you are not the only one who received this letter. Typically, scammers send the same email to all addresses they have. In other words, scam emails are not personal (in most cases).

I have provided my personal information when tricked by this email, what should I do?

If you opened a phishing page presented in this email (clicked the "RELEASE ALL (9)" button) and entered your password, change all passwords as soon as possible. Usually, scammers try to access different accounts using the same password.

I have downloaded and opened a maliciosu file attached to an email, is my computer infected?

It depends on the file type. For instance, executables infect computers after they are opened/executed. Microsoft Office documents (opened with MS Office 2010 and later versions) infect computers after macros commands are enabled. Archives (like ZIP, RAR, and others) are harmless until malicious contents are opened.

I have read the email but did not open the attachment, is my computer infected?

Your computer is not infected. It is safe to open emails even when they contain malicious links or files.

Will Combo Cleaner remove malware infections that were present in email attachment?

Yes, Combo Cleaner can detect and eliminate almost all known malware. When computers are infected with high-end malware, they must be scanned using a full system scan. It is common for malware of this kind to be hiding deep.