Hi Guest, I would just use Ambassador Jones or whatever his or her name is, for both the salutation and body of the letter. I understand "Your Excellency" is sometimes used for ambassadors. It sounds too regal for my tastes. For example,

Hello. I'm writing from Japan. I have to send an invitation letter to some Ambassadors to Japan. I know I have to use "Your Excellency" or "Excellency" as Salutation, but should I repeat Excellency all the time in my main text in the letter?

As I said in my earlier reply, politeness doesn't cost anything and you really can't go wrong if you follow ... as an invitation to them to use. I don't subscribe to modern idiom of everybody using first names for everything! When did

I can imagine. Should you choose to share some more ... we might be able to provide more relevant help. cheers, The kind of people are mainly senior persons in academia or industry, whom I ask for a favour, ie some ... you to address the wife with