Mail Delivery Failure Scam – Removal and recovery steps (updated)

what is mail delivery failure scam?

Scammers often use phishing emails to extract sensitive information (eg usernames, passwords or other login credentials, credit card details, social security numbers). it is common for them to send emails containing links to phishing websites. this particular email is disguised as a letter from the mail delivery system.

Mail Delivery Failure scam email spam campaign

mail delivery error scam in detail

The scammers behind this email attempt to trick recipients into thinking they have received an email about a failed mail delivery. more precisely, they try to trick recipients into seeing messages that supposedly could not be delivered due to some fatal error in the mail delivery system.

The “view messages” link in this phishing email opens a fake webmail website that is used to trick visitors into entering their email address and a password (login credentials for the webmail email service). Two main differences between real and fake webmail websites are their web addresses and login pages.

It is clear that the scammers behind this email are trying to steal the login credentials of the webmail accounts. Typically, stolen email accounts are used to deliver malware, send spam, send scams to trick other users into making money transactions, provide personal information, or for other malicious purposes.

It is also common for stolen accounts to be checked for emails containing personal information, sold to third parties (other cyber criminals) on the dark web. stolen login credentials could also be used to access other accounts. although scammers are only successful when users use the same login credentials for different accounts.

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similarities to other phishing emails

Most phishing emails are disguised as letters from companies, organizations, or other legitimate entities and are used to trick recipients into providing personal information that could be used to steal identities, online accounts, make purchases, and fraudulent transactions, distribute malware, or for other purposes.

more examples of phishing emails are “antispam policy violation email fraud”, “novo bank email fraud”, “ringcentral email fraud”. It is important to mention that email can be used as a channel to deliver malware. In such cases, cybercriminals use emails to trick recipients into downloading and opening malicious files.

how do spam campaigns infect computers?

Emails used to distribute malware typically contain a malicious attachment or a link to a website. Recipients install malware on their computers when they open a malicious downloaded file. Usually cyber criminals try to trick recipients into opening malicious ms office or pdf documents, javascript files, executable files like exe, compressed files like zip, rar.

It is important to mention that malicious documents opened with ms office 2010 and newer versions do not automatically install malware; they infect computers only if users enable editing/content (macro commands) on them. Malicious documents opened with older versions of ms office install malware on computers immediately after they are opened.

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how to prevent installation of malware?

Installed programs must be updated and activated using tools, functions provided by their official developers. it is never safe to update or activate them with third-party tools; those tools are often used to distribute malware. Also, it is not legal to use cracking tools or cracked (pirated) software.

Files and website links in irrelevant emails received from unknown and suspicious addresses should not be opened unless there is no reason to suspect they might not be safe. It is common for website links and attachments in emails of this type to be used to distribute malware.

Programs (and files) should be downloaded from official and trusted websites. It is not safe to use third party downloaders and installers, peer-to-peer networks, unofficial websites and other sources, tools to download or install programs. those tools, the sources can also be used to distribute malware.

A computer should be scanned for threats on a regular basis. it is recommended to scan it with a reputable antivirus or anti-spyware suite. If you have already opened malicious attachments, we recommend that you run a scan with a combo antivirus cleaner for windows to automatically remove infiltrated malware.

text presented in the “mail delivery failure scam” email letter:

subject: warning: message 1lybnf-0002y8-mj delayed 72 hours

mail delivery failure notification for “”. – the following 15 addresses had permanent fatal errors –

see messages

This notice was generated by the system on 7/12/2021 2:42:36 AM. m.

Do not reply to this automated message. this is a user verification, designed to shut down malicious users and other bot activity.

security management

copyright© 2021

Screenshot of fake webmail website used to steal login credentials:

mail delivery failure scam phishing website

another example of spam email related to mail delivery failure:

Mail delivery failure spam (2021-10-15)

text presented within:

subject: important mail error notification

error message – ********

There was an error sending incoming messages to your inbox ********. your 12 incoming messages got stuck on the remote server. this was due to your current login session error.

please re-authenticate the session below to receive your 12 incoming emails in your inbox.

note: unfetched emails will be permanently deleted from the free server clusters.

re-authenticate the session

registration team.

log ********. all rights reserved 2021.

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quick menu:

  • what is mail delivery failure spam?
  • types of malicious emails.
  • how to detect a malicious email?
  • what to do if you fell for an email scam?

types of malicious emails:

phishing emails

Cybercriminals typically use deceptive emails to trick Internet users into providing their sensitive private information, for example, login information for various online services, email accounts, or online banking information. line.

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This type of attack is called phishing. In a phishing attack, cybercriminals often send an email with the logo of some popular service (eg microsoft, dhl, amazon, netflix), create an urgency (bad shipping address, expired password, etc.) and place a link that you hope your potential victims will click on.

After clicking on the link presented in such email message, victims are redirected to a fake website that looks identical or very similar to the original one. Victims are then prompted to enter their password, credit card details, or other information that the cybercriminals steal.

emails with malicious attachments

Another popular attack vector is spam with malicious attachments that infect users’ computers with malware. Malicious attachments often contain Trojans that are capable of stealing passwords, banking information, and other sensitive information.

In these types of attacks, the main goal of cybercriminals is to trick their potential victims into opening an infected email attachment. To achieve this goal, emails often talk about recently received bills, faxes, or voicemails.

If a potential victim is tempted to open the attachment, their computers get infected and cybercriminals can collect a lot of sensitive information.

While it is a more complicated method of stealing personal information (spam filters and antivirus programs often detect such attempts), if successful, cybercriminals can obtain a much wider variety of data and can collect information for a long period of time.

sextortion emails

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

To get rid of the video, victims are asked to pay a ransom (usually using bitcoin or another cryptocurrency). however, all of these claims are false; users receiving such emails should ignore and delete them.

how to detect a malicious email?

While cybercriminals try to make their lure emails look trustworthy, here are a few things to keep in mind when trying to spot a phishing email:

  • verify the sender’s (“from”) email address: hover over the “from” address and check if it is legitimate. For example, if you received an email from Microsoft, be sure to check if the email address is and not something suspicious like,,, etc. .
  • check generic greetings: if the greeting in the email is “dear user”, “dear”, “dear customer”, this should raise suspicions. Most commonly, companies call you by name. missing this information could indicate a phishing attempt.
  • check the links in the email: hover over the link presented in the email, if the link you appears looks suspicious, don’t click on it. for example if you received an email from microsoft and the link in the email shows that it will go to… you should not trust it. it’s best not to click on any links in emails, but visit the website of the company that sent you the email in the first place.
  • don’t blindly trust email attachments Electronic: Most commonly, legitimate companies will ask you to log in to their website and 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.
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To minimize the risk of opening malicious and phishing emails, we recommend using antivirus combo cleaner 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 a link in a phishing email and entered your password, be sure to change your password as soon as possible. Cybercriminals typically 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 criminals won’t have enough time to do any damage.
  • If you entered your credit card information, please contact your bank as soon as possible and explain the situation. there’s a good chance you’ll 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 antivirus combo cleaner for windows.
  • help other internet users: report phishing emails to the anti-phishing working group, the reporting center FBI Internet Crime Reporting, the National Fraud Information Center and the U.S. department of justice.

frequently asked questions (faq)

Why did I receive this email?

Spam emails are not personal. Cybercriminals send these letters in massive operations hoping that at least some of the recipients will fall for their scams.

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

If you have disclosed account credentials, please change the passwords of all potentially compromised accounts and inform your official support without delay. and if you have exposed other private data (eg ID card details, credit card numbers, etc.), immediately contact the relevant authorities.

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

no, simply reading an email will not start any system infection chain. as malware download/install strings are triggered when attachments/links found in spam are opened/clicked.

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

The fact that an infection chain has been started may depend on the format of the opened file. if it was an executable (.exe, .run, etc), then most likely yes, your device was infected. and if it was a document (.pdf, .xls, .doc, etc), it could have prevented triggering those processes. these formats may require additional interactions (eg, enabling macro commands) to start downloading/installing malware.

will combo cleaner remove malware infections present in email attachments?

yes, combo cleaner is designed to detect and remove threats. is capable of removing virtually all known malware infections. Please note that since malware often hides deep within systems, a full system scan is essential.

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