Security
10 Signs Your Email Has Been Compromised
Tembox TeamFebruary 26, 20269 min read
A compromised email account can lead to identity theft, financial loss, and privacy violations. The sooner you detect a breach, the less damage attackers can do. Here are the warning signs that your email has been hacked — and exactly what to do about it.
Why Email Accounts Get Compromised
Email accounts are prime targets for attackers because they're the gateway to your entire digital life. With access to your email, hackers can reset passwords for other accounts, intercept financial documents, impersonate you to your contacts, and access sensitive personal information. The most common ways email accounts are compromised include password reuse from other breached sites, phishing attacks that trick you into entering credentials, malware that captures keystrokes, weak passwords that can be brute-forced, and unsecured Wi-Fi networks where data can be intercepted.
The 10 Warning Signs
Here are the key indicators that your email account may have been compromised.
1. You Can't Log In to Your Account
The most obvious sign is being locked out of your own account. If your password suddenly stops working, an attacker may have changed it. This is often the first action hackers take to maintain control of a compromised account.
2. Unfamiliar Sent Emails
Check your sent folder regularly. If you see emails you didn't send — especially spam, phishing messages, or requests for money sent to your contacts — your account has been compromised. Attackers often use hacked accounts to send malicious emails to your contacts.
3. Password Reset Emails You Didn't Request
Receiving password reset notifications from services you didn't request resets for is a major red flag. It means someone is trying to use your email access to take over your other accounts.
4. Unexpected Account Activity Alerts
Many email providers send alerts for logins from new devices or locations. If you receive alerts about sign-ins you don't recognise, someone else has access to your account.
5. Your Contacts Report Suspicious Messages
Friends, family, or colleagues telling you they received strange emails from your address is a clear sign. Attackers frequently exploit your contact list to spread malware or phishing campaigns.
More Warning Signs
6. Unknown Devices in Login History
Most email providers let you view recent login activity. Check for logins from unfamiliar devices, browsers, or locations. Pay special attention to logins from different countries or at unusual times.
7. Changed Account Settings
If your email forwarding rules, signature, display name, or recovery options have been changed without your knowledge, an attacker may have configured your account to forward copies of all emails to their address.
8. Increased Spam Volume
A sudden increase in spam or phishing emails to your inbox can indicate that your address has been compromised and shared in hacker forums or dark web marketplaces.
9. Missing Emails
If emails are disappearing from your inbox or being marked as read when you haven't opened them, someone may be accessing your account and deleting messages to cover their tracks.
10. New Email Filters You Didn't Create
Sophisticated attackers often create email filters that automatically delete security alerts, forward specific emails, or hide their activity. Check your email filter settings for any rules you didn't create.
What to Do If Your Email Is Compromised
If you notice any of these signs, take immediate action. Change your password immediately — use a strong, unique password you haven't used anywhere else. Enable two-factor authentication (2FA) to prevent future unauthorised access. Review and remove any unfamiliar forwarding rules, filters, or connected apps. Check your recovery email and phone number to ensure they haven't been changed. Notify your contacts that your account was compromised so they can ignore suspicious messages. Review other accounts that use this email for password resets and secure them as well. Scan your devices for malware that may have captured your credentials.
Prevention: Reducing Your Email Attack Surface
The best defence is prevention. Use a password manager to create unique passwords for every account. Enable 2FA on all accounts that support it. Be cautious about emails asking you to click links or enter credentials. Use a temporary email service like Tembox for non-essential signups to reduce the number of places your real email appears. The fewer databases your real email sits in, the fewer opportunities attackers have to compromise it.
Frequently Asked Questions
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