Never heard of them before. Spammed me out of the blue, with an email from partner "Peter O'Neill" designed to make it look as if I knew him from somewhere.
The spam was sent via catsoneemail.com, which has a cloaked domain registration and no web page of their own. But it appears to be related to catsone.com, which specializes in software for recruitment. In other words, a spamhaus. Yes, there is an unsubscribe link, but you should never click on a spammer's unsubscribe link.
So MAP Staffing Solutions Group are typical sleazy employement spammers. Don't do business with lowlifes like this.