I am trying to submit data  by e-mail.  The basic proof of concept works, but the only Fields I can get to populate are the ZC_From, ZC_Subject, and ZC_Content as described in the online help info.  But I am unable to get any my own custom fields to populate via e-mail.  I have tried Number, Single Line, Boolean fields, none of the populate.  The body of the e-mail is essentially just:

Field1:Data1

Field2:Data2

Field3:Data3

What am I missing?