Did you do a check on whois.com for world-teachers.com? I looked at the URL registration and found it was created in December of 2014. It is not an established site and I would do a little more digging if I was you. Also did you trace the email to see where it was from? you can do that by following the steps at http://whatismyipaddress.com/trace-email?gclid=CLuVl5vBmbcCFUFxQgodCVkAmQ. These two quick free that I use ways to check on a company.
I also Googled world-teachers.com and they don't have any page ranking or backlinks, but if they are new that is common. However, when I Googled global-teachers.com, that came up on with a page that has several unrelated links and according to whois, it has a reseller listed. If you are getting emails with both websites on the email I personally would stay away.
Hope this helps
Robert
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