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On this page: http://demo.mojoportal.com/eletter/LetterTemplateEdit.aspx?t=7f66e3ec-9e54-4c02-8e35-bbacd9a123c6
If I click on "send preview button", site error occurs.
The error in the log shows no valid email address was entered. Its a bug because it should have a validator to prevent it. I will add a validator to prevent it but it does work currently if an email address is specified.
Best,
Joe