How do I start the opening paragraph in a formal letter after having addressed the person - with a small or capital letter? Is there a difference if there is a comma or not after the "Dear X"? And should I consider American/British English?
Radek (EMAIL REMOVED - Send PM to This User Instead)
The first word in a new sentence always starts with a capital letter. The opening sentence in a letter is regarded as a new sentence.
In traditional usage, a comma follows the greeting. In the US there is an increasing use of the colon instead.