This doesn\'t seem to work:
I use the property value in the body of an e-mail message (whi
You want ${line.separator}. See this post for an example. Also, the Ant echo task manual page has an example using ${line.separator}.
By using ${line.separator} you're simply using a Java system property. You can read up on the list of system properties here, and here is Ant's manual page on Properties.