Tried it.  No joy :(

 

From: Encoded Archival Description List [mailto:[log in to unmask]] On Behalf Of Ethan Gruber
Sent: Tuesday, January 24, 2017 4:01 PM
To: [log in to unmask]
Subject: Re: line break, new line, line feed, whatever

 

try

<xsl:text>&#x0A;</xsl:text>