What is the "Mailbox Policy Update" email scam

What is "Mailbox Policy Update" scam?

After examining this email, we determined it is a phishing scam. The message impersonates a generic email service provider and falsely claims the recipient's mailbox requires immediate policy acknowledgment to avoid suspension. Its goal is to steal email login credentials from unsuspecting recipients. This email should be ignored and deleted.

"Mailbox Policy Update" email scam overview

The email arrives with the subject "Mailbox Compliance & Security Update Required" and claims the recipient's mailbox has not yet acknowledged a recent policy revision. It warns that failure to act before a stated deadline will result in temporary suspension or limited functionality.

To prevent this, the recipient is urged to click a button labeled UPDATE MAILBOX. A visible {domain} placeholder in the email's footer - a templating variable that was never properly replaced - reveals this is a mass-distributed spam operation.

Clicking the link opens a phishing page hosted on Google Cloud Storage infrastructure. The page presents a fake "Gmail Email Login" dialog overlaid on a background resembling a real Google sign-in page. Any credentials typed into this form are sent directly to the scammers.

Stolen email account credentials can cause serious harm. Attackers who gain access to an inbox can read private messages, reset passwords on linked accounts, and use the compromised address to target the victim's contacts with further attacks.

It should be noted that neither Google nor any legitimate email service provider has any connection to this scam. The phishing page is hosted on Google's infrastructure without authorization, and the company is not responsible for it in any way.

Similar scam emails in general

In summary, this email is a credential phishing scam impersonating a generic email service provider. It aims to trick recipients into handing over their login credentials on a fraudulent website. Note that scam emails like this are sometimes also used to spread malware. Recipients should ignore the message and avoid clicking any links.

More examples of similar scam emails are Capital One Card Is Locked, Secured Encrypted Message From Anthem Blue Cross, and Email Delivery Failure Notification.

How do spam campaigns infect computers?

Cybercriminals commonly distribute malware through email by attaching harmful files or embedding links that lead to malicious downloads. These files can take many forms - executable programs, compressed archives, PDF documents, Microsoft Office files, and script files are all common choices.

Some file types, such as executables, can begin the infection process as soon as they are opened. Others, like Office documents containing malicious macro commands, require the user to take an additional step before the malware activates. Either way, infection depends on user interaction, which is why caution with unexpected email content is critical.

How to avoid installation of malware?

Be cautious with any unsolicited email, particularly those urging immediate action. Do not click links or open attachments from unknown or unexpected senders. If an email claims your account needs attention, navigate directly to the service provider's official website rather than following any link in the message.

Download software only from official developer websites or legitimate app stores. Avoid pirated software, key generators, and unofficial activation tools, as these are frequent vehicles for malware. Keep your operating system and all installed applications updated to reduce exposure to known security vulnerabilities.

Use a reputable security tool and run regular scans. Consider enabling two-factor authentication on email and other important accounts - it adds a layer of protection even if passwords are compromised. If you have already clicked a suspicious link, we recommend running a scan with Combo Cleaner Antivirus for Windows to detect and remove any threats.

Text presented in the "Mailbox Policy Update" email letter:

Subject: Mailbox Compliance & Security Update Required

Mailbox Policy Update

Your account requires attention to maintain uninterrupted access.
Registered Mailbox
********

Hello,

To improve account security, reliability, and service performance, we have updated our Mailbox Terms of Service and Usage Policy.

Important Notice

According to our records, your mailbox has not yet acknowledged the latest policy revision.

To prevent temporary suspension or limited mailbox functionality, please review and accept the updated terms before:

June 10, 2026 at 11:59 AM

Once completed, your mailbox will remain active without interruption. The review process takes less than a minute.

[UPDATE MAILBOX]

If you have recently completed this verification, no further action is required.
{domain}
Security & Compliance Department
© 2026 All Rights Reserved.

A fake Gmail login page used in this scam:

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:

By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Combo Cleaner. 7 days free trial available. Combo Cleaner is owned and operated by RCS LT, the parent company of PCRisk.com.

Quick menu:

• What is Mailbox Policy Update phishing scam?
• Types of malicious emails.
• How to spot a malicious email?
• What to do if you fell for an email scam?

Types of malicious emails:

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.

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 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:

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?

Scam emails like this are not personally targeted. Cybercriminals distribute them in bulk to large numbers of recipients, using addresses gathered from data breaches, fake websites, and similar sources.

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

If you entered your email password on the linked page, change it immediately and update it on any other accounts where the same password is used. Contact your email provider's official support team. If you also disclosed payment details or identification documents, notify the relevant institutions or authorities right away.

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

That depends on the file type. Executable files typically trigger infection as soon as they are opened. Document formats such as PDFs or spreadsheets generally require additional interaction - such as enabling macros - before malware can run.

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

No. Simply reading an email is harmless. Your computer is only at risk if you clicked a link, opened an attachment, or otherwise interacted with malicious content in the message.

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

Combo Cleaner can detect and remove most known malware infections. That said, running a full system scan is important, as advanced threats can hide deep within the system and may require thorough scanning to be found and eliminated.