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When writing a letter , the subject of the letter could appear at the beginning of the letter as "Re:__________". Should it be in bold letters? if it should be in bold, sould it be like this: "Re: writing a letter" or "Re: writing a letter".
I appriciate it if you send me a sample official letter . (In the site ther are rules for writing a letter but no referrence to the above issue.
This is a matter of personal preference. If you want to bold it, then do so; if you want to underline, then do so. There is no hard and fast rule in the matter.
writing a letter 
Re: writing a letter 
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