You must, ti have warning/error/all message send an false email via token management : manual.limesurvey.org/Survey_participants#Sending_emailsoleggorfinkel wrote: ...filled out and submitted the survey, which completed correctly, but again, no email and no error message of any kind...
Then you are sure you have the error.
You can just create a survey with token without question, you dpon't have to activate it. And send an email to you .