Email Security

The use of emails has always been increasing ever since its inception in the 1960s. Business communication, circulation of academic information, conveying personal information – almost everything is passed on between individuals or organizations via emails mainly for either or all of the following reasons:

  • Emails are faster.
  • Emails are reliable.
  • Emails ensure that the information reaches the end recipient and, if not, notifies the sender about it.
  • There is no scope of data loss with emails.
  • Emails are an excellent means of recording information chronologically.

Email Security Service

Read More...

Are Emails Secure?

On the surface, there is nothing to be concerned about in email communication. The accounts of both the sender and the receiver are self-operated and locked by passwords which only both of these parties know. However, with the advancement of useful technology occurs an equal (if not higher) rise in technology which brings vicious attackers and hackers into the picture.

What Is Phishing?

Phishing attacks are just like fishing in a river where a person tries to get hold of a fish by giving it a believable bait of a bread crumb or any similar bit of food. However, in phishing attacks, the fishes are the netizens, and the fishermen are the cyber attackers. Phishing attacks are most commonly circulated via email messages. In such attacks, an unexpected mail from a seemingly credible source asks the receiver to take specific immediate action (such as paying unpaid dues or claiming a reward) by clicking on an attached link or downloading a file. But these are impersonating emails taking the user to fake websites created by the attacker. And often, these install malware into the computers of users. These attacks also happen in other forms like through voice messages (Vishing), SMS frauds (Smishing), attacks targeting the big shots of an organization from whom the profits can be maximum (Whaling) or creating a replica of a website to win the trust of an unsuspecting user (Pharming).

What Is Malware?

Malware is another means used by attackers to install corrupt files and software into the computer systems of users without their permission or against their will. Often malware operates secretly and steals the private information of users without their knowledge. This information is then accessed by the attacker who either uses the data to blackmail the victim, launch a sextortion campaign, or sell the stolen details at a high price in the dark market. Its types include:

  • Ransomware – which locks the system of the user or encrypts files until the demanded ransom is paid.
  • Spyware – which launches spying software into the computer and steals data.
  • Scareware – which attempts to extract user information by instilling fear in them.
  • Adware – where malware gets downloaded via attacker-created fake advertisements.

What Is Email Security?

Email security is the process of shielding email accounts from the attacks of vicious hackers. It refers to the means employed by a user, an organization, or an information network to keep themselves secure from these phishing attempts and malware attacks.

How To Ensure Email Security?

Email security can never be a fool-proof plan as the attackers always manage to find some loophole even in the most sophisticated methods of protection. However, minimizing such attacks is the objective, and this can be achieved by adopting the following measures:

  • Setting strong passwords: Strong passwords with alphanumeric characters and symbols are highly recommended. It’s always more important to have secure passwords instead of easy to remember passwords.
  • Changing passwords from time to time: Using the same password for too long makes you more vulnerable to hacking attempts of attackers. Hence it is always advisable to change passwords from time to time. Also, having different passwords for different accounts is a smarter decision than otherwise.
  • Having a good antivirus installed: Antivirus software creates a layer of protection against all types of viruses and malware trying to attack your devices. It is a must to have an antivirus when you visit multiple websites on the Internet or install external devices and disks into your computer.
  • Having anti-spam filters: Anti-spam filters ensure that spam emails or messages do not show up in your mailbox, thus protecting your system from the malicious emails sent by attackers. It also saves you a lot of time and energy that gets wasted otherwise in opening those emails.
  • Using only updated software: Software developers update software from time to time to incorporate patches and other improvements to make the software secure and more efficient. Not updating one’s software to the latest version is sending an invitation to attackers to steal your files.
  • Being wise on the web: With everything said and done, the most frugal tip remaining is to be careful on the Internet. One must have a skeptical mind and halt before impulsively clicking on links and pop-ups. A click takes hardly a second, but often its after-effects cost millions of dollars!

Since one cannot do away with emails, one needs to find ways and means of doing away with the threats to email security. Protecting yourselves on the web is not easy but also not unachievable. Taking specific preventive measures goes a long way in keeping attackers and malware away.


What is TLS encryption and how does it work?

What is TLS encryption and how does it work?

 

TLS, which is short for Transport Layer Security, is an email security protocol based on cryptography. It facilitates the end-to-end security of data transmitted between applications over the Internet. Most people know it as the padlock icon that appears in web browsers when a secure session is established. But there is more to it—it’s also used in emails, file transfers, video and audio conferencing, instant messaging, and voice-over IP.  The overall aim of the TLS is to add an extra layer of security, preventing threat actors from hijacking connections between internet-enabled devices. It lets you know whether the person you are communicating with is actually who they are claiming to be. 

(more…)

DKIM alone is not enough

DKIM alone is not enough

 

You might have heard that you do not necessarily need all three email authentication protocols— SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting, and Conformance) to create a foolproof defence strategy for your email ecosystem. But here’s a truth that these custodians of security do not tell you: achieving a 100% foolproof email security strategy is very challenging, if not impossible, and you need a multi-layered approach that covers all the bases and helps you stay ahead of these attacks. 

(more…)

SPF alone is not enough

SPF alone is not enough

 

Here’s a question for you: how much security is too much security for your emails? Before you try to answer this question, we would like to remind you that email security threats like phishing, spam, ransomware, malware, and spoofing are not only becoming more frequent but also more grave. The kind of impact these attacks have on the target is often devastating, including financial loss, data breach, and legal consequences. With these threats looming over your email ecosystem, you need a mechanism that is robust and hardy.

(more…)

SPF=Fail, but the recipient’s mailbox has not quarantined or rejected the email- why?

SPF=Fail, but the recipient’s mailbox has not quarantined or rejected the email- why?

SPF=fail, but the recipient’s mailbox has not quarantined or rejected the email- why?

by Duocircle

 

When an email shows ‘SPF=fail’ but is not blocked by an antispam filter, it can be due to several reasons. Knowing and fixing the issue is important; otherwise, threat actors can exploit the security gap by sending fraudulent emails in your business’ name. 

  (more…)

Enabling Microsoft’s Exchange Online Protection (EOP) phishing policies using the Microsoft Defender portal

Enabling Microsoft’s Exchange Online Protection (EOP) phishing policies using the Microsoft Defender portal

Enabling Microsoft’s Exchange Online Protection (EOP) phishing policies using the Microsoft Defender portal

by Duocircle

 

There is a default anti-phishing policy that is applied to all recipients, but it’s better to create custom policies for better protection. To configure the anti-phishing policies, you need to be assigned permissions in the Microsoft Defender portal. If you have the required permissions, you are good to go ahead and make modifications. 

(more…)

Why does RFC impose the character limit on SPF records?

Why does RFC impose the character limit on SPF records?

 

As per RFC, if an SPF record has more than 255 characters, then it will be invalid. This simply means that such an SPF record would give false positives and negatives– neither of them works in favor of your domain. 

(more…)

Understanding the relevance of Secure Email Gateways (SEGs)

Understanding the relevance of Secure Email Gateways (SEGs)

 

Secure Email Gateways (SEGs) are like your email infrastructure’s personal security guards. They ensure only safe and legitimate emails go out from your company, keeping it protected from email-based attacks. The overall practice of deploying SEGs prevents the distribution of malware and phishing attempts through emails, instills trust in your clients and prospects, helps you stay compliant with industry standards, and, most importantly, wards off litigations and financial damages. (more…)

Everything you should know about obtaining a Verified Mark Certificate (VMC)

Everything you should know about obtaining a Verified Mark Certificate (VMC)

Everything you should know about obtaining a Verified Mark Certificate (VMC)

by Duocircle

 

When it comes to ensuring the success of your email campaigns, something that is just as important as the content of the email is the trust it inspires in your recipients. The way the receivers and their mail servers perceive your emails tells a lot about your brand’s identity and credibility

(more…)

Learning to perform SPF delegation for enhanced email delivery

Learning to perform SPF delegation for enhanced email delivery

 

The SPF delegation method is for domain owners who authorize an external email server to send emails on their behalf without having them fail the email authentication checks. This requires you to make some alterations to the existing SPF record.

(more…)

How to find a DKIM selector for your domain?

How to find a DKIM selector for your domain?

 

The risk of cybercriminals intercepting your emails and tampering with them is perpetual. But there’s a way to mitigate this risk and make sure that your emails are delivered unaltered without any malicious interference. Implementing DKIM or DomainKeys Identified Mail is your masterstroke against email tampering and spoofing. It relies on cryptographic techniques to sign your emails, allowing recipients to verify that they truly originate from your domain and have not been messed with.

(more…)

Preventing DKIM replay attacks

Preventing DKIM replay attacks

 

Threat actors bypass DKIM authentication checks with the DKIM replay attack technique. This allows them to attain a copy of a valid email and replay it with additional or replaced From, To, or Subject headers. As the original DKIM signature is valid, the replayed version also passes the DKIM authentication checks. This way, even phishing and spoofing emails land in the recipients’ inboxes instead of spam folders.

(more…)

Learn to configure trusted ARC sealers

Learn to configure trusted ARC sealers

 

Email authentication has become a non-negotiable standard for companies and governments, as it prevents phishing, spoofing, ransomware, and other email-based cyberattacks. Email authentication protocols also raise alerts for modified email contents as these changes indicate tampering done by threat actors.

(more…)

What is the Google Critical Security Alert email?

What is the Google Critical Security Alert email?

 

Google has always prioritized user safety and has designed the Google Critical Security Alert to warn users whenever a threat actor or unauthorized person tries to access your Google account. This security feature also alerts you if there is a login to your account from a new or unrecognized device, allowing you to deny access if you don’t recognize the device. You receive a notification on your primary device (in which the particular Google account is logged in), where you have to click on either of the options – ‘Yes, it’s me’ or ‘No, secure account.’ You may also receive this notification via email. 

(more…)

How does ARC subside the shortcomings of SPF, DKIM, and DMARC?

How does ARC subside the shortcomings of SPF, DKIM, and DMARC?

How does ARC subside the shortcomings of SPF, DKIM, and DMARC?

by DuoCircle

 

Email authentication protocols like the Sender Policy Framework (SPF), DomainKeys Identified Mail (DKIM), and Domain-based Message Authentication, Reporting, and Conformance (DMARC) are considered to be robust mechanisms to protect against cybersecurity threats such as spoofing and phishing. This is when you are sending emails from your domain, but when it comes to forwarding emails, these protocols fall short.

(more…)

A guide to DKIM syntax– create your DKIM record for free

A guide to DKIM syntax– create your DKIM record for free

 

A DKIM record is a DNS record in the TXT format that includes a public key that is used by recipients’ mail servers to verify the legitimacy of emails they receive from your domain. A standard DKIM record has a name, version, key type, and public key. Some domain owners think that creating a DKIM record requires hardcore technical expertise, but that’s not true, especially when it comes to generating a basic DKIM record. You just need to be an average tech user, and you will be able to create a DKIM record on your own.

(more…)

How to fix “Your DKIM signature is not valid” error

How to fix “Your DKIM signature is not valid” error

How to fix “Your DKIM signature is not valid” error

by DuoCircle

 

Email authentication protocols are the foundation of your email security strategy, and even the most seemingly insignificant error can mess up your deliverability and security. One such issue is an invalid DKIM signature, which means there are inaccuracies in your domain’s DomainKeys Identified Mail (DKIM) configuration.

(more…)

Configuring DKIM to sign mail from your Microsoft 365 domain

Configuring DKIM to sign mail from your Microsoft 365 domain

 

The main purpose of DKIM is to verify whether a malicious entity tampered with email content in transit. To ensure this, a pair of public and private keys are produced for your domain and used by the source email systems to digitally sign the headers of outgoing messages. This digital signature remains valid until intermediate email systems modify the signed part. The d= value represents the signing domain in the header field.

(more…)

How to fix the 550 5.7.26 unauthenticated sender error in Gmail?

How to fix the 550 5.7.26 unauthenticated sender error in Gmail?

How to fix the 550 5.7.26 unauthenticated sender error in Gmail?

by DuoCircle

 

Back in October 2023, Google released its revamped version of email-sending policies, which mandated bulk email senders to comply with the new authentication standards by February 2024. Cut to today: Google has now officially started rolling out these updated policies, and some organizations are receiving the following error message while sending emails:

(more…)

Pin It on Pinterest