Our company has just received an identical letter and we also are dubious whether this is a legitimate enquiry or an "agressive marketing".
2 interesting facts: 1) Together with your case, this is the 4'th letter reported in the same week
2) 2 of the domains mentioned had .info and .biz suffix - which are not, to the best of my knowledge, China local.
Did anybody verify the legitimacy of Shanghai Squile?

yoshd