Start by determining the source of the emails:

1. Check your email filters and settings
2. See if the email is from a legitimate source
3. Ensure the email is not coming from a spoofed email address

Next, if the emails are indeed coming from an unknown source, take the following measures:

1. Review the email content to see if they pose a security threat
2. If the emails are spam, mark them as such and they should be sent to your spam folder
3. Check your email privacy policies for additional options to block or filter the unknown emails