This is feedback via our feedback page!
http://aaisp.idea.informer.com/proj/aaisp?ia=10461
The ideas site does not accept e-mail addresses which contain plus symbols in the local part.
Worse than that, having wrongly assessed my valid e-mail address as invalid, it then throws me back to the data entry page, but all the text I spent the last 5 minutes writing has now disappeared!
...Round where I live, we know no better than to consult RFC5322, which is only the normative standard which defines what constitutes a valid e-mail address.