WARNING: New Internet scam out of a shoebox office in Florida. Called Domain SEO Service Registration Corp. It's the same, tired old false flag operation.

1.) Perpetrator looks up domain names (owner contact information is public)
2.) Perpetrator e-mails domain-name owner with an official looking "Payment Notice"
3.) Threatening "expiration" deadlines are made in the Payment Notice

The perp makes it look like you are renewing your domain name, but in reality, and through some seriously twisted use of English language (that leaves one's head swimming), you are signing up for one year of search-engine optimization. Most people would not understand this, and the perp wants it that way. Here's an example of the language used in the spam email:

 
ATTENTION: IMPORTANT NOTICE
 
EXPIRATION NOTICE
 
DOMAIN: xxxxxxx.xxx
Notification Purchase Traffic Generator Offer