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In a salutation on a line by itself, which version is punctuated correctly?

Hi, Mr Lawler,

I am writing to say [...]

Hi Mr Lawler,

I am writing to say [...]

Hi, Mr Lawler.

I am writing to say [...]

Alex W
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whippoorwill
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1 Answers1

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None of them are punctuated correctly, according to American English conventions, because abbreviations must be followed by a full stop. In British English, no full stop following Mr is perfectly fine, however.

According to the Purdue OWL, business letter, i.e. very formal, salutations must be followed by a colon (:). And the comma between the title and interjection depends on whether the noun is being directly addressed (or as you said: in the vocative case). So, Dear Mr. Lawler: requires no comma because it is an adjective modifying the noun, whereas Hello, Mr. Lawler: requires a comma because it is directly addressing the noun.

So, this would be the suggested usage, based on those guidelines:

Hi, Mr. Lawler:

I am writing to say [...]

The Purdue OWL also mentions a less common format, known as open punctuation, whereby no punctuation is present after the salutation and valediction:

Hi Mr Lawler

I am writing to say [...]

Thank you

[Your name]

Please note that "Hi" is can be interpreted as somewhat of an informal greeting and should probably be replaced by a more formal greeting like "Hello" or "Dear".

Alex W
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    I find the use of Hi followed by Mr So & So strange. Hi is rather informal, and I would not use it with Mr So & So. – None Mar 02 '14 at 19:13
  • @Laure I agree. I was thinking of making a note of the fact that "Hi" is rather informal but I never did, since the question was only asking about punctuation. – Alex W Mar 02 '14 at 19:42
  • I always thought that if we used, say, "Hi, Mike", we'd need a comma after "Hi" or "Hello" because the name is a form of direct address and is in the vocative case. Hmmm. Interesting. – whippoorwill Mar 02 '14 at 19:44
  • I think the 'open punctuation' format looks really nice, clean and uncluttered. I don't know whether it would be accepted in formal circumstances, though. – whippoorwill Mar 02 '14 at 19:47
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    @whippoorwill You are correct about the vocative case. The OWL only omits the comma for "Dear". I have updated the answer with that new information. – Alex W Mar 02 '14 at 20:23
  • No period after "Mr" is perfectly fine in British English, and something I encounter and produce every day. The colon, on the other hand, is something nobody at all actually ever does, including the students of the Purdue University I have happened across so far... – RegDwigнt Mar 02 '14 at 21:37