Email remains the single most exploited entry point for cyberattacks. It is also the tool most professionals use more than anything else at work. That combination makes email security one of the most important and most overlooked areas of personal and organisational cyber hygiene.
The good news is that improving your email security does not require a technical background. Most of the measures that make a genuine difference are straightforward to implement and take less time than you might expect.
Understand What You Are Actually Up Against
Before improving your defences, it helps to understand the threats. The most common email-based attacks fall into a few categories:
Phishing is the practice of sending emails designed to trick you into clicking a malicious link, entering credentials on a fake website, or downloading a harmful attachment. Phishing emails increasingly look identical to legitimate messages from banks, software providers, or colleagues.
Business email compromise (BEC) is a more targeted form of attack where criminals impersonate executives, suppliers, or trusted contacts to manipulate employees into transferring money or sharing sensitive information. These attacks rarely involve malware — they rely entirely on deception.
Malicious attachments are files — often disguised as invoices, contracts, or shared documents — that install malware or ransomware when opened.
Account takeover happens when an attacker gains access to your actual email account, either through a phished password or a credential breach, and uses it to attack others or monitor your communications.
Knowing these categories helps you recognise the patterns before they catch you off guard.
Use Strong, Unique Passwords and a Password Manager
The majority of account takeovers happen because people reuse passwords across multiple services. When one service suffers a data breach, those credentials are tested against email providers, banking platforms, and corporate systems — often automatically and at scale.
The fix is simple: use a different, strong password for every account, and store them in a reputable password manager so you do not have to remember them. A strong password is long (at least 16 characters), random, and contains no personal information.
If you suspect any of your passwords have been exposed, change them immediately and check services like Have I Been Pwned to see which accounts may be at risk.
Enable Multi-Factor Authentication on Every Email Account
Multi-factor authentication (MFA) requires a second form of verification — typically a code sent to your phone or generated by an authentication app — in addition to your password. Even if an attacker obtains your password, they cannot access your account without that second factor.
MFA is one of the single most effective security measures available, and most email providers support it. If you have not enabled it on your work and personal email accounts, doing so should be your first priority.
Authenticator apps (such as Google Authenticator or Microsoft Authenticator) are more secure than SMS codes, which can be intercepted. Where possible, use an app rather than a text message.
Learn to Spot Suspicious Emails
No technology fully replaces human judgement. Training yourself to recognise suspicious emails is one of the most reliable defences available. A few things worth checking before you click anything:
- The sender address — does it match the organisation it claims to be from exactly? Attackers often use domains that look similar at a glance (e.g. support@micros0ft.com).
- Urgency and pressure — legitimate organisations rarely demand immediate action under threat of consequences. Urgency is a manipulation tactic.
- Unexpected attachments or links — if you were not expecting a file or link, verify with the sender through a separate channel before opening it.
- Requests for credentials or payment — no legitimate service will ask for your password via email, and financial requests should always be verified verbally.
When in doubt, do not click. Contact the sender directly using a known phone number or address, not the contact details provided in the suspicious email.
Make Sure Your Organisation Has the Right Tools in Place
Individual habits matter, but they are not enough on their own. The volume and sophistication of email-based threats have reached a point where technical controls are essential for any organisation.
A capable email security solution should filter malicious content before it reaches inboxes, detect and block phishing attempts and spoofed senders, and flag suspicious patterns that individual users are unlikely to notice. Platforms like Heimdal integrate these capabilities in a way that works quietly in the background — protecting employees without adding friction to their daily workflow.
If you are unsure what email security tools your organisation currently has in place, it is worth asking your IT team. Understanding your coverage is a reasonable and important question.
Keep Software and Devices Updated
Many email-based attacks succeed not through deception alone but by exploiting vulnerabilities in outdated software. When an attachment is opened or a link is clicked, attackers often rely on unpatched flaws in email clients, browsers, or operating systems to execute malicious code.
Keeping your devices, applications, and email client up to date closes these entry points. Enable automatic updates wherever possible so security patches are applied without requiring manual action.
The Takeaway
Email security is not a single setting you switch on — it is a set of habits and tools that work together. Strong passwords, MFA, a healthy scepticism toward unexpected messages, and the right organisational tools each play a role. None of them is complicated, and together they make a significant difference to your exposure to one of the most common and costly forms of cybercrime.
Lynn Martelli is an editor at Readability. She received her MFA in Creative Writing from Antioch University and has worked as an editor for over 10 years. Lynn has edited a wide variety of books, including fiction, non-fiction, memoirs, and more. In her free time, Lynn enjoys reading, writing, and spending time with her family and friends.
