There is such an awesome conversation going on at inbound.org about professional salutations on email. The version you see below is a concise version of the salutation examples discussed there (if you don't have the time to go through every comment).
The United States, (if you are writing to them in English) Turkey, Brazil, Ukraine, Spain, Portugal, Ireland, Israel, India, Singapore. This is typically true if you are sending emails to executives in the tech, internet, media industries and to an audience that's mostly young people.
Poland, Germany, Japan, (if sending a formal email) Netherlands, Brazil, India, Singapore
This is Brazil's equivalent of Hi, but do notice the 'comma' that comes between the name and the salutation.
This is Brazil's equivalent of Dear. Caro is for a man and Caro is for a woman. Prezado is for a man and so on.
The French like to be formal. There isn't any 'Hi' in business communication. It's Bonjour or Bonjour Monsieur.
The Romanians go with an informal 'Salut' or a formal 'Buna Ziua' (meaning, Good day!). In fact, in informal contexts, it's pretty ok to skip the salutation altogether.
Try your bit of Hebrew when you communicate with the Israeli.
How does your country respond to opening lines/salutations in an email? Are there any nuances worth noting?
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