I take it you mean in the 'Dear Sir/ Dear Fred' part. I have never seen a colon used in this situation. Either use a comma, or for a more modern look even in formal letters, skip the puncutation altogether.
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CalifJimAll:
I used colons in that context just last week several times.
I've been using them for years.
Is this a sign that I've become old? Or just old-fashioned?
AnonymousWhat difference does it make? Give your Dear Whoever and move along with what's important and that is the text (body) of your letter. Get to the business of things and leave the picky things for those who want to create their own style of salutations.Well, for the same reason you use good grammar and spelling. It says "I know how to condu