Guess which is the error:
Best Regards,
OR
Best regards,
In email after email (including two this morning), I find people incorrectly capitalizing the complimentary close. The rule is to capitalize only the first word of the close. This rule applies wherever you use a complimentary close: emails, letters, notes, and even texts. These are all correct:
Best regards,
Best wishes,
Warm wishes,
With deep sympathy,
Sincerely yours,
My best,
All best,
With thanks,
The complimentary close isn’t a title or a heading, so there’s no need to capitalize all the nouns or important words–just the first word, whatever it is.
Note: Sometimes people refer to the complimentary close as the salutation. Don’t let them fool you. The salutation is the greeting.
See this article for tips on capitalizing common message greetings, such as “Good morning“.
Lynn
Syntax Training