It is common to begin an email with the greeting "hi all" when the note is addressed to multiple recipients.
What, however, is the correct capitalization of "all" in this context? Does it become a proper noun?
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Grammatically "Dear" and "Hi" are not the same. While "Dear" can be used to modify the noun, "Hi" is a statement on its own. So starting off a letter use "Dear all," or "Hi, all." Note that "Hi, all." is a complete sentence ending with a period.
Now to capitalize "all" or not. Stylistically, it has been common to capitalize "all" in "Dear All," but I can identify no grammar rule to support that practice. "All" is not a proper noun. Only proper nouns (personal names) are capitalized.
Note, when ending a letter, the proper grammar is to use "Best regards," or "Thank you,". The second word is not capitalized, whether it is a noun or not.
In you example, “All” starts with capital A because that’s the first word of that sentence like “In” is here. Otherwise in no means and ways, in should start with a capital I.
Grammar fundamentals are simple and straight. Unless you use title casing, nothing sould start with capital unless it’s a noun.
As we are referencing email specifically here, the correct form is 'All'. Email and letter salutations are typically capitalised. Outside of those instances, however, lowercase it is.
Also see this blog post: https://www.grammarly.com/blog/good-morning-capitalized/
The accepted answer is incorrect.
"All" is indeed a proper noun. For example, it's correct to say, "All are going to the event."
The grammatically correct version of the salutation is,
Another answer explains as well: Capitalization of "A" in "Dear All"