Email is the most common form of communication in any business — which is exactly why it's a favorite target for cybercriminals. Through phishing, spam, or malware, attackers try to get hold of personal data or access to your systems. The following six questions let you screen any email in a matter of seconds and significantly reduce your risk of falling victim to an attack.
1. Do you recognize the sender?
The first step in checking an email is taking a closer look at the sender. Does the message come from a known address, or a source you trust? Be skeptical of unexpected emails from companies or people you don't directly know. Fake email addresses often look trustworthy at first glance but reveal small deviations on closer inspection — a typo in the domain, or unusual characters. If the sender is unknown to you and the email offers no clear explanation, it's best not to open it and delete it instead.
Even when a sender looks familiar, it's worth checking the exact email address. Cybercriminals frequently use addresses that are only slightly altered to appear trustworthy. If in doubt, compare the address against previous, known emails from that same sender.
2. Is the subject line plausible?
The subject line often already hints at whether an email is phishing. Spam and phishing attempts are deliberately worded to be vague and alarming, designed to make you open the message quickly. Classic examples include "Your Invoice," "Payment Reminder," "Urgent Message," or "Account Locked." Check whether the subject actually matches the content of the email and your current situation: would you really expect an invoice or an urgent message from this sender? If not, proceed with caution and don't open the email.
3. Would you actually expect an attachment from this sender?
Email attachments are one of the most common ways malware spreads. If you receive an email from an unknown sender with an attachment that has no obvious relevance to you or that you weren't expecting, be careful. Many malicious programs hide inside seemingly harmless files like PDFs or ZIP archives. Even with a familiar sender, ask yourself: would you genuinely expect an attachment from this person or organization? If not, don't open the attachment — delete the email instead, or report it as spam.
4. Is the text written correctly?
Flawed or unprofessional writing is a classic warning sign of phishing emails. Imprecise wording, grammar mistakes, or illogical sentences are usually easy to spot if you read carefully. Watch for clumsy translations, odd sentence structure, or spelling errors — legitimate companies and organizations typically keep their communication professional and error-free.
5. Do the links lead to a trustworthy website?
Links are one of the most common phishing tools. Before clicking a link, hover your mouse over it without clicking, and check the URL that's displayed. Phishing emails frequently try to lure recipients to fake websites that closely mimic the real ones. If the URL looks suspicious or doesn't match the stated sender, don't click it under any circumstances.
6. Is the email demanding a fast response?
Artificially created time pressure is a hallmark of phishing and scam emails. Phrases like "Respond immediately," "Open within 24 hours," or "Otherwise your account will be locked" are designed to push recipients into acting without thinking. Legitimate companies rarely communicate with this kind of urgency. If you receive an email demanding an especially quick response, take a moment to assess the situation calmly instead of reacting right away.
Security awareness is your best defense against phishing, malware, and spam
A short, targeted check before opening any email significantly reduces your risk of falling victim to phishing, malware, or spam. Check the sender, subject line, and attachment, and ask yourself whether the content and context make sense. If even a small doubt remains, delete the message and avoid opening attachments or clicking links. Security awareness remains the most effective way to protect your data and systems.
Frequently Asked Questions About Email Security
How can I recognize a phishing email? By red flags such as an unknown or slightly altered sender address, an alarming subject line, an unexpected attachment, poorly written text, suspicious links, or artificially created time pressure.
What should I do if I've received a suspicious email? Don't open any attachments, don't click any links, and delete the email or report it as spam/phishing. In a business setting, you should also notify your IT department.
Is a spam filter enough to protect me on its own? No. Spam filters catch many, but not all, attacks. Consciously checking the sender, subject, attachment, text, links, and urgency remains an important additional layer of protection.
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