Hello lapislazuli, and welcome to English Forums. 1. -- No dot is becoming the accepted form, but both are OK.
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Anonymous I believe that the first sentence actually starts with the salutation which is followed by a comma and therefore a capital letter is not used (unless it is a proper noun) again in that first sentence. I was taught this way 40 years ago and am surprised to realise that most people are now capitalising the first word after the salutation.Well, when I