[Carruthers]

Not only did Monster beat me too it, she's somewhat more concise!

FWIW...

Don’t touch it with a barge pole. You will either be roped in to a money laundering racket or similar criminal enterprise, or you will be relieved of your own money. Heaven alone knows what they will be sending to you if you sign up for the former.

Doing a search on royal mail-com.us returns nothing but you might wish to dig a little deeper. If you right click on the item in your Inbox and select ‘Properties’ on the drop down menu, a dialogue box will appear.
Click the ‘Details’ tab then ‘Message Source’. You won’t open up anything nasty by doing this. You’ll then see the unformatted message in another larger box. A couple of lines down you’ll see the Sender IP.
Do a search on WHOIS, or simply a Google search and you should find out where the mail originates. My money’s on Nigeria, China , Russia, or other East European country.

BTW, the words below may well be relevant to your Email.