Do not trust "Blocked (Important) Incoming Messages" phishing emails

What kind of email is "Blocked (Important) Incoming Messages"?

"Blocked (Important) Incoming Messages" is a spam email, which our inspection revealed to be a phishing scam. This letter attempts to deceive recipients into revealing their email account log-in credentials by claiming that a number of messages have failed to reach their inbox.

"Blocked (Important) Incoming Messages" email scam overview

The email with the subject "[recipient's_email_address] (4) Important Message Pending!!!" (may vary) informs that four new messages are pending arrival into the inbox. According to this fake letter, the emails were blocked because of a server error. The names of the nonexistent messages relate to payments.

As mentioned in the introduction, this spam email is fake, and all its claims are bogus. Therefore, when the "VIEW ALL YOUR MESSAGES" link is clicked, it results in a redirect to a phishing site. This website is presented as an email account sign-in page.

The data (i.e., email account passwords) entered into this webpage are revealed to the scammers behind this spam campaign. Victims of this scam risk more than just losing their email account, as the cyber criminals can also steal associated content (e.g., accounts, platforms, services, etc., registered with the email).

To expand upon how this unauthorized access can be abused, scammers can use stolen financial accounts (e.g., online banking, e-commerce, digital wallets, etc.) to make fraudulent transactions and/or online purchases. Cyber criminals can pretend to be the actual owners of communication accounts (e.g., email, social networking, social media, etc.) and ask the contacts/friends/followers for loans/donations or spread malware by sharing malicious files/links.

To summarize, by trusting emails like "Blocked (Important) Incoming Messages" - users can experience severe privacy issues, financial losses, and even identity theft.

If you have already provided your log-in data to a phishing website, we strongly advise changing the passwords of all potentially compromised accounts and contacting their official support without delay.

Phishing spam campaign examples

"Request To Terminate/Disable Your Email", "Password Is Scheduled To Expire", and "DHL Express - CONFIDENTIALITY NOTICE" are just a few of our latest finds within the phishing email category.

Deceptive letters are used to facilitate all manner of scams, and they are often used to proliferate trojans, ransomware, and other malware. These emails can wear a broad range of disguises that may be competently crafted. Due to this and the prevalence of spam mail, we highly recommend exercising caution with incoming emails and messages.

How do spam campaigns infect computers?

Spam campaigns proliferate malware by distributing virulent files. These files can be attached to and/or linked inside the emails. Infectious files can be Microsoft Office and PDF documents, executables (.exe, .run, etc.), archives (ZIP, RAR, etc.), JavaScript, and so forth.

Once such a file is executed, run, or otherwise opened - the infection process is triggered. For example, Microsoft Office documents infect devices by executing malicious macro commands.

How to avoid installation of malware?

We advise vigilance with incoming emails and messages. The attachments and links found in suspicious/irrelevant mail must not be opened since that can result in a system infection. We recommend using Microsoft Office versions released after 2010, as they have the "Protected View" mode that prevents automatic macro execution.

However, malware is distributed using a variety of methods. Therefore, we also advise downloading only from official and trustworthy sources. Furthermore, it is crucial to activate and update software using functions/tools provided by legitimate developers, as illegal activation ("cracking") tools and third-party updates may contain malware.

Another recommendation is to be careful when browsing since fraudulent and malicious content typically appears ordinary and innocuous.

We must stress the importance of having a dependable anti-virus installed and kept up-to-date. Security programs must be used to run regular system scans and to remove threats. 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 "Blocked (Important) Incoming Messages" spam email letter:

Subject: ******** (4) Important Message Pending!!!

Blocked (Important) Incoming Messages

Your 4 incoming new messages are suspended on the server pending receiving.
There was a server error on:

Date: 9/13/2022 6:06:56 a.m.
User: ********

To view and release all messages, use the link: VIEW ALL YOUR MESSAGES
Quarantined email
Recipient:     Subject:     date:
1.     ********      Payment Returned      
2.     ********       Remmitance Copy       
3.     ********      Re: Proforma Invoice     
4.     ********      Re:Payment

Screenshot of the phishing website promoted by the "Blocked (Important) Incoming Messages" spam campaign:

Other examples of blocked incoming messages-themed spam emails promoting phishing sites:

Sample 1:

Text presented within:

Subject: LAST WARNING: Email Server Blocked Incoming Messages

Email Server Blocked Incoming Messages

Dear ********

This message(s) below have been blocked by your mail server. According to our check, the issue is caused by the spam dictator which needs upgrade on your Email: ********, which results mail messages not being delivered and getting stuck on the server.

There are new messages in your mail Quarantine messages will be automatically removed from quarantine after 7 day(s).

To see all quarantined messages click here to  Upgrade Your Mail Box  and release messages to inbox.
 
Quarantined email
   Recipient:              Subject:  Date:
Release  info@yahoo.com, CC: sales@taiw.....  Incoming Transfer from Sale@.... [HSBC]  Thursday, 19th Feb, 2023 07:54 a.m.
Release  remittance@hsbc.com, 992830198@163..  Re: Re: Contract | INVOICE COPY   |   Thursday, 19th Feb, 2023 08::23 a.m.
Release  ********, CC: info@tradeca.....  Re: SALES ORDER CONFIRMATION SO: 0057528  Thursday, 19th Feb, 2023 10:20 a.m.
Release  Dhlcargo@dhl..., CC: sales@yahoo.com
Dhl Express Shipment 889000787 Notification  Thursday, 19th Feb, 2023 10::23 a.m.
Open all messages

Bounced Queue - 85
Please resolve the issue within 24 hours.
===================================================================
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 interrogation:

Regards,
Mail Service Provider.

This notification was sent to you ********; Don't want occasional updates about subscription preferences and friendly suggestions?

Screenshot of the promoted phishing site:

Sample 2:

Text presented within:

Subject: Your storage is almost full You have 10 pending messages for delivery to your mail box.

Blocked incoming messages for ********
You have 10 pending messages for delivery to your mail box.

Authorize Delivery for pending mails

failure delivery messages
Actions:     Recipient:     Subject:     Date:
Release ******** RE:  SIGNED CONTRACT, REVIEW AND SEND BACK SUBMISSION OF THE DRAFT SALES AND PURCHASE AGREEMENT: SAUDI ARABIA     12/04/2023 12:22:09 a.m.
Release ******** RE: RFQ Invite for Budgetary Proposal for WSCO/FCO for Diesel EN590     12/04/2023 12:32:09 a.m.
Release ******** RE: PAYMENT SWIFT COPY SABIC-BANK TRANSFER SLIP as per the Policy     12/03/2023 12:43:09 a.m.
Release ******** RE:COMMERCIAL OFFER FOR  PETROLEUM LLC SOFT CORPORATE OFFER COST FREIGHT INSURANCE (CIF) 2023        11/28/2023 12:32:09 a.m.
(more...6)

Note: This message was sent by the system for notification only.  
 
If this message lands in your spam folder, please move it to your inbox folder for proper integration.

(c) Poweredby: IT ********  Support.

Cp

Copyright© 2023 cPanel, Inc.

Screenshot of the promoted phishing site:

Sample 3:

Text presented within:

Subject: Action Required: You have 5 pending messages on ********'s Outbox

********
Some of your incoming messages have been blocked due to insufficient storage space as of 04/03/2024 2:50 PM
Check your Email below and resolve this by fo11owing the steps outlined

Get extra 5GB storage and view undelivered messages in inbox

CHECK INBOX

Sample 4:

Text presented within:

Subject: You have [10] undelivered emails.

Blocked Incoming Messages

Dear ********,

You have (10) Undelivered mail 9/10/2026 4:32:20 PM.

This is due to system delays.

View pending emails

Thank you!

© 2026 ******** . All rights reserved.

Instant automatic malware removal:

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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?

Cyber criminals distribute spam emails in large-scale operations - hence, thousands of users receive identical messages.

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

If you have disclosed log-in credentials - immediately change the passwords of all potentially exposed accounts and inform their official support. And if you have revealed other private information (e.g., ID card details, credit card numbers, etc.) - contact the appropriate authorities without delay.

I have read a spam email but didn't open the attachment, is my computer infected?

No, opening/reading an email will not initiate any system infection processes. The malware download/installation chains are jumpstarted by opening the attachments or links found in spam mail.

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

Whether an infection occurred might depend on the opened file's format. Executables (.exe, .run, etc.) infect devices almost without fail the moment they are opened. While documents (.xls, .doc, .pdf, etc.) may need additional user interactions (e.g., enabling macro commands) to begin downloading/installing malicious programs.

Will Combo Cleaner remove malware infections present in email attachments?

Yes, Combo Cleaner is capable of detecting and eliminating practically all known malware infections. It must be emphasized that performing a full system scan is essential - since high-end malicious software typically hides deep within systems.