Do not trust fake "Messages Not Delivered Due To Server Interruptions" emails

Also Known As: "Messages Not Delivered Due To Server Interruptions" phishing email
Damage level: Medium

What kind of email is "Messages Not Delivered Due To Server Interruptions"?

Our inspection of the "Messages Not Delivered Due To Server Interruptions" email revealed that it is spam. This phishing letter aims to trick recipients into disclosing their email account credentials by making false claims regarding undelivered messages.

Messages Not Delivered Due To Server Interruptions email spam campaign

"Messages Not Delivered Due To Server Interruptions" email scam overview

The spam email with the subject "Mail Delivery: [7] Undelivered incoming messages" (may vary) informs the recipient that messages have failed to reach their inbox due to server interruptions. Immediate action is required to avoid data loss (i.e., to prevent the loss of the undelivered emails).

The letter instructs to click the "Email Account Settings" button in order to review the pending messages and to fix any bugs. The recipient is warned that if they fail to do so, they may also experience interruptions with the sign-in process to their email account.

As mentioned in the introduction, this letter is fake, as are all its claims. When we followed the link presented in this spam message (i.e., clicked the button), it resulted in a redirect to a phishing website. The page was disguised as an email account sign-in page.

Log-in credentials (i.e., email account addresses and corresponding passwords) entered into this phishing site will be disclosed to the cyber criminals behind this spam campaign. Not only can the criminals steal the exposed email account with this information, but they may also hijack the content registered through it.

Stolen content can be variously misused for profit, to elaborate – finance-related accounts (e.g., online banking, e-commerce, digital wallets, etc.) can be used to make fraudulent transactions or online purchases.

Scammers can also steal the identities of social account owners (e.g., emails, social networking, social media, etc.) and ask their contacts/friends/followers for loans, promote scams, and even distribute malware by sharing malicious files or links.

In summary, the threats posed by a spam email like "Messages Not Delivered Due To Server Interruptions" include system infections, severe privacy issues, financial losses, and identity theft.

If you have already disclosed your log-in credentials – change the passwords of all potentially exposed accounts and contact their official support without delay.

Threat Summary:
Name "Messages Not Delivered Due To Server Interruptions" phishing email
Threat Type Phishing, Scam, Social Engineering, Fraud
Fake Claim Due to server interruptions, message failed to reach the email inbox.
Symptoms Unauthorized online purchases, changed online account passwords, identity theft, illegal access of the computer.
Distribution methods Deceptive emails, rogue online pop-up ads, search engine poisoning techniques, misspelled domains.
Damage Loss of sensitive private information, monetary loss, identity theft.
Malware Removal (Windows)

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Phishing spam campaign examples

We have analyzed thousands of spam emails; "Product Availability Confirmation", "Measures To Strengthen Server Security", "Incoming Mails Have Been Restricted", and "Documents Inquiry" are just some examples of ones used for phishing.

Various scams are promoted using emails, including phishing, sextortion, tech support, lotteries, inheritances, etc. In addition to deceptive content, this mail is used to proliferate malware (e.g., trojans, ransomware, cryptominers, etc.). These letters can even be disguised as messages from legitimate service providers, companies, corporations, institutions, authorities, and other entities.

Due to how prevalent spam mail is, we highly recommend exercising caution with incoming emails, PMs/DMs, SMSes, and other messages.

How do spam campaigns infect computers?

Spam emails can contain infectious files as attachments or download links. These files can be archives (RAR, ZIP, etc.), executables (.exe, .run, etc.), documents (Microsoft OneNote, Microsoft Office, PDF, etc.), JavaScript, and so forth.

When a virulent file is executed, run, or otherwise opened – the malware download/installation process is triggered. For example, Microsoft OneNote documents require users to click on embedded files/links to start downloading/installing this software, while Office files infect devices by executing malicious macro commands.

How to avoid installation of malware?

We strongly advise against opening attachments or links found in suspicious mail, as they can be malicious and cause infections. It is essential to use Microsoft Office versions released after 2010 since they have the "Protected View" mode that prevents automatic macro execution.

However, malware is not proliferated exclusively via spam mail. Therefore, we recommend downloading only from official and verified channels. Additionally, all programs must be activated and updated using legitimate functions/tools, as illegal activation tools ("cracks") and third-party updaters may contain malware.

Another recommendation is to exercise caution while browsing since fake and dangerous online content typically appears ordinary and harmless.

We must stress that having a reputable anti-virus installed and kept up-to-date is paramount to device and user safety. This software must be used to run regular system scans and to remove detected threats and issues. 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 "Messages Not Delivered Due To Server Interruptions" spam email letter:

Subject: Mail Delivery: [7] Undelivered incoming messages

Dear -,

Your incoming messages has been not delivered due to server interruptions.
This could lead to loss of data and information, immediate action is required.
Go to Email account settings below to review undelivered mails and fix bugs.

Email Account Settings

Failure to review your account may cause login interruption.

Copyright © 2023 All Rights Reserved.

Screenshot of the phishing website promoted through this spam campaign:

Messages Not Delivered Due To Server Interruptions scam email promoted phishing site

Another example of an undelivered mail-themed spam promoting a phishing site:

You have 3 important message that were not successfully delivered to your Inbox spam

Text presented within:

Subject: Email Notification: You have (3) pending messɑges


Your email account  ******** has Undelivered messages. Resolve issue to avoid termination of mails.

Dear ********,

You have 3 important message that were not successfully delivered to your Inbox

[ ******** ], as a result of inbox malfunction and lack of mail validations

Note: If the above actions are not performed messages will be deleted within hours of your reception of the mail

******** IT Administrator for ********

Screenshot of the promoted phishing site:

Phishing site promoted via You have 3 important message that were not successfully delivered to your Inbox spam

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Quick menu:

Types of malicious emails:

Phishing email icon Phishing Emails

Most commonly, cybercriminals use deceptive emails to trick Internet users into giving away their sensitive private information, for example, login information for various online services, email accounts, or online banking information.

Such attacks are called phishing. In a phishing attack, cybercriminals usually send an email message with some popular service logo (for example, Microsoft, DHL, Amazon, Netflix), create urgency (wrong shipping address, expired password, etc.), and place a link which they hope their potential victims will click on.

After clicking the link presented in such email message, victims are redirected to a fake website that looks identical or extremely similar to the original one. Victims are then asked to enter their password, credit card details, or some other information that gets stolen by cybercriminals.

Email-virus icon Emails with Malicious Attachments

Another popular attack vector is email spam with malicious attachments that infect users' computers with malware. Malicious attachments usually carry trojans that are capable of stealing passwords, banking information, and other sensitive information.

In such attacks, cybercriminals' main goal is to trick their potential victims into opening an infected email attachment. To achieve this goal, email messages usually talk about recently received invoices, faxes, or voice messages.

If a potential victim falls for the lure and opens the attachment, their computers get infected, and cybercriminals can collect a lot of sensitive information.

While it's a more complicated method to steal personal information (spam filters and antivirus programs usually detect such attempts), if successful, cybercriminals can get a much wider array of data and can collect information for a long period of time.

Sextortion email icon Sextortion Emails

This is a type of phishing. In this case, users receive an email claiming that a cybercriminal could access the webcam of the potential victim and has a video recording of one's masturbation.

To get rid of the video, victims are asked to pay a ransom (usually using Bitcoin or another cryptocurrency). Nevertheless, all of these claims are false - users who receive such emails should ignore and delete them.

How to spot a malicious email?

While cyber criminals try to make their lure emails look trustworthy, here are some things that you should look for when trying to spot a phishing email:

  • Check the sender's ("from") email address: Hover your mouse over the "from" address and check if it's legitimate. For example, if you received an email from Microsoft, be sure to check if the email address is @microsoft.com and not something suspicious like @m1crosoft.com, @microsfot.com, @account-security-noreply.com, etc.
  • Check for generic greetings: If the greeting in the email is "Dear user", "Dear @youremail.com", "Dear valued customer", this should raise suspiciousness. Most commonly, companies call you by your name. Lack of this information could signal a phishing attempt.
  • Check the links in the email: Hover your mouse over the link presented in the email, if the link that appears seems suspicious, don't click it. For example, if you received an email from Microsoft and the link in the email shows that it will go to firebasestorage.googleapis.com/v0... you shouldn't trust it. It's best not to click any links in the emails but to visit the company website that sent you the email in the first place.
  • Don't blindly trust email attachments: Most commonly, legitimate companies will ask you to log in to their website and to view any documents there; if you received an email with an attachment, it's a good idea to scan it with an antivirus application. Infected email attachments are a common attack vector used by cybercriminals.

To minimise the risk of opening phishing and malicious emails we recommend using Combo Cleaner Antivirus for Windows

Example of a spam email:

Example of an email spam

What to do if you fell for an email scam?

  • If you clicked on a link in a phishing email and entered your password - be sure to change your password as soon as possible. Usually, cybercriminals collect stolen credentials and then sell them to other groups that use them for malicious purposes. If you change your password in a timely manner, there's a chance that criminals won't have enough time to do any damage.
  • If you entered your credit card information - contact your bank as soon as possible and explain the situation. There's a good chance that you will need to cancel your compromised credit card and get a new one.
  • If you see any signs of identity theft - you should immediately contact the Federal Trade Commission. This institution will collect information about your situation and create a personal recovery plan.
  • If you opened a malicious attachment - your computer is probably infected, you should scan it with a reputable antivirus application. For this purpose, we recommend using Combo Cleaner Antivirus for Windows.
  • Help other Internet users - report phishing emails to Anti-Phishing Working Group, FBI’s Internet Crime Complaint Center, National Fraud Information Center and U.S. Department of Justice.

Frequently Asked Questions (FAQ)

Why did I receive this email?

Spam emails are not personal. They are distributed in massive operations – therefore, 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 your log-in credentials – immediately change the passwords of all possibly compromised accounts and inform their official support. And if you've provided 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, merely opening an email will not initiate system infection processes. Malware download/installation processes are initiated when malicious attachments or links are opened.

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

If the opened file was an executable (.exe, .run, etc.) – most likely, yes – your device was infected. And if it was a document (.doc, .xls, .one, .pdf, etc.) – you might have avoided triggering an infection. These files may need additional user interaction (e.g., enabling macro commands, clicking on embedded content, etc.) to start downloading/installing malware.

Will Combo Cleaner remove malware infections present in email attachments?

Yes, Combo Cleaner can scan devices and eliminate practically all known malware infections. It must be emphasized that since high-end malicious software typically hides deep within the system – running a complete system scan is paramount.

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About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

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