It seems very strange indeed. I would avoid like the plague any agency or company that doesn't provide any contact details, other than an email address. There are a couple of threads on a Thai forum making reference to skycrewing, with an attachment of a job description for cabin crew. It's on company paper, but there are no details about the companies registered office, and how to contact them. They call themselves SkyCrewing Ltd, so they should have a registered office somewhere in the world.
Having done a little digging, the domain skycrewing.com (which appears to be their email domain) was registered on the 9th of Feb this year, so it looks like they are either new boys (or girls) on the block, or its yet another scam.
Who knows, but personally, I'd avoid.
Last edited by mini-jumbo; 31st May 2013 at 10:59.