Hm, and what about the comma at the end of the greeting line? Can a sentence end with something else than a period, particularly a comma? I've seen it very often as common practice to write the greeting in the first line, ending with a comma, then continuing the message in a new line. And since bare line breaks look odd from a typographical point of view, I'm trying to use paragraph breaks instead where I can. Their plaintext representation is two subsequent line breaks. So if the second paragraph is a new sentence (and actually, I doubt that a sentence can be distributed over more than one paragraph), the greeting should end with a full stop. But then again, is a greeting part of a normal sentence or do greetings have their own grammatic regulations... I'm not an expert in this field really...