Hello,
I believe you can do this with a formula in the Google sheet where the Form submissions are stored:
Have one column with the formula that checks as follows...
If the contents of the answer are "Checkbox 1", use email 1(kulis)
If the contents of the answer are "Checkbox 2", use email 2(julie)
Once you have done the formula as you need, you will have to set the settings in Formemailer to use closure mode: formulas, and enter the "Sheetname!A:B" in the formula location field of the settings, in my example the script isn't installed so I don't have the settings as an example.
Hope this helps.