Change the line spacing in an email message in Outlook

1. In the message you're composing in classic Outlook, select the paragraphs whose line spacing you want to change.

2. Select Format Text and choose   Line and Paragraph Spacing.
   If you don't see   Line and Paragraph Spacing, select the ellipsis (...) and choose it from the menu. 

3. Select the spacing you want. Or, for more options, choose Line Spacing Options.

You can adjust the line spacing within a paragraph, and you can adjust the spacing between paragraphs in new Outlook for Windows:

1. In the message you're composing, select the paragraphs whose line spacing you want to change.

2. On the Format text tab in new Outlook, select   Spacing, then select a numeric option.

   (The larger the number the greater the line spacing.)

3. On the Spacing menu in new Outlook​​​​​​​ for Windows, the last two options are for spacing between paragraphs: you can add spacing before or after the select paragraph.