The reason why you get it like that is because the email body of the Outlook email is formatted as HTML, while your list is plain text. In order for your list to actually show every new item in a new line in the email, you need to append <br> (a line break) to each item, so it looks like this:
Item1<br>
Item2<br>
Item3<br>
Item4<br>
This is the easiest structure to do it. You could also put in a more complex HTML structure, such as an unordered list with list items like this:
<ul>
<li>Item1</li>
<li>Item2</li>
<li>Item3</li>
<li>Item4</li>
</ul>
If you go the <br> way, the easiest way to do it is to use Join text and join your list using <br> as a custom delimiter. This will result in a single string in PAD, but will actually be shown properly as a list in the Outlook email.
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