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Use your email provider’s phishing-reporting control for suspicious messages, and block repeat senders separately if needed. Before clicking anything, check the full sender address and link destination; never follow an unexpected password or payment request from an email. If you send mail from a business domain, configure SPF, DKIM, and DMARC to help receiving services detect messages impersonating your domain. These steps address different risks: inbox filtering, domain authentication, and account sign-in security.
What to do when a suspicious email arrives
- Do not interact with it. Avoid unexpected links and attachments, and do not provide passwords or financial details in response to the message. If it claims there is urgent trouble with an account, open the service’s official app or type its known website address yourself. Google recommends avoiding suspicious links and downloads and reporting suspected phishing: Avoid & report phishing emails.
- Check the sender and destination. A familiar display name is not proof of identity. Inspect the full email address, look for provider warnings or a mismatch with the apparent sender, and check where a link leads before opening it. Microsoft explains how to recognize phishing and suspicious behavior in Outlook: Phishing and suspicious behavior in Outlook.
- Report the message as phishing. Use the mail service’s reporting control so it can treat the message as suspected abuse. Reporting and blocking are separate actions in some services.
- Block a repeat sender if appropriate. Blocking is useful for unwanted repeat mail, but it does not establish that the sender’s address is genuine or protect your account if you already disclosed a password.
Report phishing and block senders separately
Gmail
Open the suspicious message and use Gmail’s phishing-reporting option. Google also advises users not to click suspicious links or download files. A missing warning is not proof that a message is safe; verify account problems through the service’s official website or app instead. See Google’s Gmail phishing guidance for current instructions.
Outlook.com
Use Outlook’s report control for a suspected phishing message. Microsoft states: “When you mark a message as phishing. the sender is reported but is not blocked from sending you additional messages.” If you want to stop later mail from that sender, use Outlook’s separate block-sender control. Current options and labels may vary across Outlook versions; consult Microsoft’s Outlook guidance.
Secure your email account against stolen passwords
Turn on multifactor authentication (MFA) for your email account. Where supported, prefer a phishing-resistant FIDO/WebAuthn method, such as a compatible hardware security key. CISA identifies FIDO/WebAuthn methods as phishing-resistant and recommends MFA for valuable accounts, including email: Require Multifactor Authentication and Implementing Phishing-Resistant MFA.
#1 Best Overall
- POWERFUL SECURITY KEY: The Security Key C NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key C NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key C NFC via USB-C and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
A security key protects sign-in; it does not filter incoming mail or prevent a spoofed message from reaching your inbox. Confirm that your email provider and the devices you use support the chosen method. CISA’s Mobile Communications Best Practice Guidance also discusses phishing-resistant authentication.
Protect a business domain from spoofed mail
If your organization sends email using its own domain, ask your email or domain provider to help publish and maintain SPF, DKIM, and DMARC records for every legitimate sending service. These mechanisms help receiving systems assess whether mail claiming to come from your domain is authorized. The FTC cautions that setup takes expertise, because misconfiguration can block legitimate mail: Cybersecurity for Small Business.
Rank #2
- POWERFUL SECURITY KEY: The YubiKey 5 NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5 NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5 NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
| Control | What it does | What to check |
|---|---|---|
| SPF | Specifies which sending systems are authorized to send for a domain. | Include every legitimate sending service, including third parties. |
| DKIM | Allows receiving systems to check a domain-associated digital signature on a message. | Confirm the sending services sign mail correctly and that the published keys are maintained. |
| DMARC | Connects authentication results to the visible From domain and tells receiving systems how to handle unauthenticated mail claiming that domain. | Start with a monitored policy and verify legitimate senders before strengthening enforcement. |
Google’s Email sender guidelines describe sender requirements and authentication considerations. Domain authentication can reduce impersonation of your domain, but it does not stop every form of phishing or protect users from messages sent from unrelated domains.
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For a scam impersonating a business, the FTC points businesses to guidance on stopping a would-be business impersonator, including reporting channels such as ReportFraud.ftc.gov and IC3.gov. The FTC also says phishing emails may be forwarded to the Anti-Phishing Working Group. Check the current official reporting instructions before sending information.
Quick Recap
Rank #4
- POWERFUL SECURITY KEY: The YubiKey 5C NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5C NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5C NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
Rank #3
- Security Key : Protect your online accounts against unauthorized access by using FIDO2 and U2F authentication with T110. It's the world's most protective security key that works with windows, Mac OS, Linux as well as Chrome, Firefox, Edge and many other major browsers.
- Certified with the new FIDO2 standard, T110 provides the benefit of fast login and strong protection against phishing, account takeover as well as many other online attactks.
- Works with : Bank of America, Github, Google, Microsoft, DUO, Twitter, Facebook, Dropbox, Apple, ebay, BINANCE, mor and more.
- Fits USB-A port : Insert the T110 security key into the USB-A port of each service and log in conveniently with one touch
- For the driver download and user guide, please visit TrustKey Solutions Home support page.
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