There is SEO related scam in progress since many years but lately lot of our clients started receiving emails like below which look like their domain name is going away and they may lose the domain name if not paid immediately kind of offer which is most of the business person will go and do if they are not tech savvy. Following is an example of one of such email well formatted html email look like a pure notice or something but I am just putting text here.

From: Attention Expiring Registration for Domain [mailto:ricardo97308@example.com]
Sent: 04 December 2011 05:56
To: client@YOURDOMAIN.COM
Subject: FWD: Notification of Registration of YOURDOMAIN.COM

Important Notice
Name: YOURDOMAIN.COM
Bill To: Invoice #1322958339
Invoice DateDec 3, 2011
TermsNet 14
- USDue DateDec 18, 2011
+91. P.O. #
128BIT SECURE ONLINE PAYMENT
Domain NameRegistrationPriceTerm
YOURDOMAIN.COM
Dec 3, 2011 - Dec 3, 2012$75.001 Year
Attn :
This solicitation is to inform you that it's time to send in your search engine registration for YOURDOMAIN.COM. We are a search engine ranking and submission service organization.
Failure to complete this order by Dec 18, 2011 may result in the cancellation of this offer (making it difficult for your customers to locate you using search engines on the web).
YOURDOMAIN.COM registration will include search engine submission for 1 year. You are under no obligation to pay the amount stated above unless you accept this offer by Dec 18, 2011. This notice is not an invoice. It is a courtesy reminder to register YOURDOMAIN.COM for search engine listing so that your customers can locate you on the web.
Act Soon! This Offer for YOURDOMAIN.COM will expire on Dec 18, 2011. Act today!
For Domain Name:
YOURDOMAIN.COM
128BIT SECURE ONLINE PAYMENT (LINK to payment gateway - http://example.com/order/orderidentifying string, i am keeping text only)
optoutnow (linked to http://example.com/unsubscribe/customeridentificatoinstring)

Highlighting here so others be aware and tell their customers about it. Although it is clearly written that this is for 1 year SEO submission services it is deceives business owners and I know it is one of many.

[edited by: bill at 6:16 am (utc) on Dec 5, 2011]
[edit reason] edited specifics [/edit]