Job email received: "NOT expecting US persons, since wage level is to low."

[drm604]

I received this email this evening from an online jobs website.

Dear David,

We wanted to notify you immediately about a new job posting that may fit your interest and skill set. Please review the information below. You can easily access the job description by clicking on the link provided.

Title: Senior Mod_Perl Application Programmer
Opportunity: XXXXXXXX
Location: XXXXXXXXX, XX
Categories: Information Technology, Education, Training, & Library
Description: Applications being used by K-12 Schools in the US. The code is quite deep and poorly documented, having grown over the course of 5 years. NOT expecting US persons, since wage level is to low. Requirements: Must be excellent written English skill. Must have deep Application Perl experience. A chat interview and assignment will qualify the individual. More then 1 position available immediately. ... View Details
Apply Now

Clicking on "View Details" shows a wage of $10+ per hour and a requirement of a 4 year college degree.

Since they emailed it to me, and they have my resume, which shows a US address, and they state that they are not exepecting "US persons" it appears that they are advertising specifically for H1-B workers. Is this legal?

I am, by the way, a US citizen (born and raised) so they wouldn't want me anyway. Not that I'd accept that job at that wage.

Whoever the employer is, they are in a small town (pop. around 3600 in 2000) so it probably wouldn't be difficult for me to find who they are.