Remove “Your Email Is Blocked Because The Sender Is Unauthenticated” email

The “Your Email Is Blocked Because The Sender Is Unauthenticated” email is part of a phishing campaign that aims to steal users’ email account passwords. The email mimics the email service provider and claims that your email has been blocked because the “sender is unauthenticated”. Supposedly, receiving email servers cannot verify your domain’s identity and are thus rejecting your email. The email asks that you fix the error by clicking on the provided link. However, if you were to click on it, you would be taken to a phishing site imitating Gmail and asked to type in your password. If you were to do that, your password would be stolen and sent to the malicious actors operating this phishing campaign. This could allow them access to your email account if it’s not protected by multi-factor authentication.

 

The “Your Email Is Blocked Because The Sender Is Unauthenticated” email is a very generic phishing attempt, and most users should be able to identify it as such fairly easily. It’s trying to imitate an email from the email service provider, but does a poor job. The email informs you that because email servers cannot verify your domain’s identity, your emails are rejected to prevent spam. The email has a “FIX THE ERROR” button, which will lead to a phishing site.

The phishing site is imitating Gmail’s login page. Your email address will already be entered, but the password field will be empty. If you enter your password, it will be stolen. The operators behind this phishing campaign may exploit the stolen login credentials themselves or sell them to other cybercriminals.

Email account credentials are highly valuable to cybercriminals. Accessing an email account can grant entry to linked accounts and services. Furthermore, if users do not routinely delete sensitive emails, their inboxes may contain a wealth of confidential information that could be exploited.

If you have engaged with this “Your Email Is Blocked Because The Sender Is Unauthenticated” or similar phishing email, you need to immediately change your password if you still have access to your email account. If the accounts are inaccessible and recovery options are ineffective, you need to disconnect the compromised email from all associated accounts to prevent further unauthorized access.

The full “Your Email Is Blocked Because The Sender Is Unauthenticated” email is below:

Subject: For -: (Your Email is Blocked)

USER:-

Your email is blocked because the sender is unauthenticated. Most receiving email servers can’t verify your domain’s identity and are rejecting your message to prevent spam.

This 550 5.7.26 unauthenticated sender error will continue if the problem is not fixed. See below:

FIX THE ERROR

Attention: SPF, DKIM will be validated
DMARC and DNS is confirmed.

Mail Support

© 2023 –

You have received an automatic, mandatory email to update you about important changes to the Cpanel Webmail Platform or your account.

What are the signs of a phishing email?

Phishing emails targeting everyday users are often generic and relatively easy to identify. They usually contain multiple clues that expose their malicious intent, making them recognizable to users who know what to look for. More advanced phishing attempts are designed to target high-profile individuals whose personal information may have been compromised. These highly tailored emails are polished, free of grammar mistakes, mention credible information, and appear very professional. Fortunately, most users are unlikely to receive such sophisticated emails.

When dealing with an unsolicited email urging you to click a link or open an attachment, your first course of action should be to verify whether the sender’s email address matches the one that belongs to whoever the sender claims to be. Low-effort phishing attempts often come from random and clearly suspicious email addresses, making them easier to detect. More advanced phishing attempts, however, may use seemingly legitimate email addresses or employ deceptive techniques to mimic trusted senders. A quick online search can help confirm whether the email address genuinely belongs to the person or organization it claims to represent. In some cases, malicious actors may use spoofing techniques to make it seem like the email was sent from users’ own accounts.

Another key indicator of a phishing email is poor grammar and spelling mistakes, which are common in low-quality phishing attempts. Reputable companies rarely make such mistakes, so their occurrence can serve as a warning sign. Additionally, emails addressing recipients with generic terms like User, Member, Customer, or email usernames instead of their actual names may indicate a phishing attempt. Legitimate organizations always address their customers by name in official communications. For instance, in the “Your Email Is Blocked Because The Sender Is Unauthenticated” message, the recipient is addressed by their email username, which confirms it’s a malicious email.