If you are using double quotes (") around your body content, you can use \n for a line break. However, if you are using single quotes (') around your body, you can simply enter a line.
Example (")
$body = "Line One\nLine Two";
This would come out as:
Line One
Line Two
Example (')
$body = 'Line One
Line Two';
This would also come out as:
Line One
Line Two
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