I can get access to the default variables, but not ones set by setenv plugin or by any build steps.
When this is fixed we should make sure that the recipients can be set as well as the email content.
There are a couple of related patches out there.
Access to node env variables:
I'm not sure if this should be opened against email-ext or setenv plugin.
There is not currently a setenv component in jira so I'm opening this against email-ext.
A recent discussion of this issue: http://n4.nabble.com/How-to-use-environment-variables-td1012822.html#a1012822