Scammers have created the phishing website "Wallmart.com" and have sent emails to thousands of persons with links to the website, in an attempt to steal their personal information. Do not confuse the same website with the legitimate website "walmart.com". The difference is the scammers have created the scamming website name by adding an extra "L" to the legitimate website's name.
The legitimate website name is: WALLMART.com and the scamming website name is: WALLMART.com. Note the scamming website has an extra "L".
The phishing email that is being sent has the subject "Thanks for your Walmart.com Order" and contains links to the phishing website Wallmart.com.
The phishing email scam will claim that you have ordered something from Wal-Mart.
The WALLMART.com Phishing Email

Do not click on any of the links in this email message and do not visit the website Wallmart.com. And, when visiting Wal-Mart’s website, do not click on any links to go the website, instead type "walmart.com" in your web browser address bar and press the "Enter" key or click the "Go" button.

This will ensure that you are on the legitimate website, WALMART.COM and not some other fake website.
The legitimate website walmart.com issued the following statement:
There was a false email sent to a number of people this morning claiming to be from Walmart.com. This email looks like a confirmation of a purchase made on Walmart.com, but is actually a phishing email attempting to gather information from the recipient. Again, this email is not from Walmart.com and it is important that recipients DO NOT click on any links in the email or respond in any way. We are investigating the source of the email and working with appropriate authorities. For more details, visit the Walmart.com Help Center.