Why Email Notifications May Show "[CAUTION SPOOFING]" in the Subject Line

Learn why email notifications may show “[CAUTION SPOOFING]” and what actions to take if it appears.

Details

If an email notification displays a subject line containing [CAUTION SPOOFING], this warning is not generated by PortPro. It is added by the recipient’s email provider, antivirus, or anti-malware software as a security precaution.

This flag is automatically triggered when the recipient's system suspects the email may be spoofed or potentially malicious. It’s typically configured via:

• Custom email rules

• Security filters

• Malware or spam protection services

Next Steps

To address this:

1. Verify the sender – Confirm the email is coming from a legitimate PortPro email address.

2. Check your email security rules – Review the configuration in your email or antivirus platform.

3. Consult your IT administrator – If necessary, whitelist PortPro’s sending domain or modify filtering rules.