Indented style-blank line

[effie]

Hello,
When writing a letter to the Editor of a Newspaper (formal letter) using indented style should we leave a blank line between paragraphs?

Or should we leave a blank line only in block style?
Thank you

[Ouisch]

Traditionally, if you're indenting paragraphs, you would not leave blank spaces. If you're using the block format, where all your lines start flush at the left margin, then you would double-space in between paragraphs.

[effie]

Thank you very much.
Effie