For the supported parameters for this template depend on the WvEmail property and the template that process it.
Check out the WvTextTemplate supported parameters
Check out the WvTextTemplate supported parameters
Check out the WvTextTemplate supported parameters
Check out the WvTextTemplate supported parameters
Check out the WvTextTemplate supported parameters
Check out the WvHtmlTemplate supported parameters
Check out the WvTextFileTemplate supported parameters
The attachments are processed either by WvTextFileTemplate or WvSpreadsheetFileTemplate