When receiving suspicious emails or messages from unknown sources, it is important to take the following steps:

1. Do not click on any links or open any files that are contained in the email or message.
2. Do not reply to the message or forward it to anyone else.
3. If the message appears to have come from a trusted source, you should contact that entity directly via a phone call or through other contact methods.
4. If the message is strongly suspected to be malicious or fraudulent, consult your IT security team.