She wrote, "When writing letters, what is the 'proper' protocol on indenting?
" There are several proper ways to format a traditional business letter. These days most business letters follow the full-block style, with nothing indented.
If you were to use both line-spacing and indentation of paragraphs, that would simply be redundant.
What's important is that it's clear to your reader where paragraphs begin and end, and that the text is laid out in a way that's easy to read.
Some organizations use this style, which looks neat but not sleek.
Fussy and dated looking: the modified-block style with indented paragraphs.
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It used to be mandatory to indent the beginning of every paragraph, along with double spacing after periods.
Now, whether you start with an indentation is just a matter of personal/corporate preference. A clear typesetting would make sure that the separation of paragraphs is clear to the readers.