Do you need a macro for this? The Outlook e-mail editor uses a subset of Word and as such uses paragraph styles - see the Format Tab. Create or modify a style to give you the spacing that you want. Do however note that the recipient may not see it the same way - especially if the recipient uses a different e-mail application.

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com